The additional recipe ranks can be obtained either by exploring the outdoor Broken Isles zones or as rewards when you dive into the dungeons of the region. If you’re feeling up to the challenge, you can aim to hit skill level 100 and player level 100 to open up profession world quests, which rewards higher rank recipes for your Legion gold making operation.
About the Blacksmithing, Leatherworking and Engineering professions; I feel like crafted gears are fairly different in BFA and not nearly as strong as it was in Legion. That’s why these three professions are at the bottom. Only reasonable things that come out of these professions are mounts. Engineers have Mecha-Mogul Mk2 which is a pretty good-looking mount but every engineer will try to make and sell mount, so I feel like the market is gonna have a lot of competition for that.
I would also like to point out, just because it gave me a giggle, that in one sentence you highlight that everyone is trying to make gold in BfA and then in another direct people back to the Engineering/JC mounts as a proposed solution. While I appreciate the suggestion, you seem smart enough to realize that those, too, are saturated markets. They have been for years now, so that's just moving from one camped market to another.

Professions are skills used to create and enhance items (gears). You will start with one skill once your character has learned a profession. When you use the profession, your skill will increase. A profession’s higher skill will allow you to create more powerful items. If you change a primary profession, you will lose any skill you have made with your original profession. So it is important to choose your primary professions wisely.

 Highmountain tauren - "Descended from Huln, brave hero of the War of the Ancients, the Highmountain tauren honor the spirits of earth, river, and sky. Though the Legion invaded their lands and sowed seeds of distrust between them, the tribes of Highmountain stand united once more. At long last they are ready to venture beyond their sacred mountain and stand beside their kin from Kalimdor, lending their nobility and strength to the mighty Horde."
Despite all of these problems and this laundry list of glaring systematic issues, the crowning achievement of Battle for Azeroth’s endgame is that it still remains enjoyable all due to those two pillars of raiding and dungeons. That won’t last forever. As the expansion goes on, and the grind necessary to progress becomes even more demanding and the time spent in content that simply isn’t fun increases, it will be harder and harder for raiding and Mythic+ to carry the expansion along.
I have been playing since 2005. I have never really relied on the auction house to make my gold (I don't have the time, what with me having a life and all). In fact, I hardly ever use it. But as the years went by, I've always managed to get my gold total to progressively increase with each expansion. Not so with BFA. In fact, my total has actually gone down since BFA launch. Is this normal? Yes, I have been buying items from the rep guys, but I do that with every expansion. My gold started stagnating a bit before BFA, but since launch ... wow! I guess I can kiss that dinosaur mount goodbye!
Azeroth paid a terrible price to end the apocalyptic march of the Legion’s crusade—but even as the world’s wounds are tended, it is the shattered trust between the Alliance and Horde that may prove hardest to mend. As this age-old conflict reignites, gather your allies and champion your faction’s cause—for Azeroth’s future will be forged in the fires of war.
I think you have legitimate concerns, but to be fair the squish already happened, the numbers just haven't caught up yet. You can already craft current-expansion items starting at crafting level 1, and those crafts generally award 3-5 levels each. So squishing the ranks from 800 down to 100, doesn't functionally change anything, it just allows crafts to only award 1 skill point per use, instead of 5.

I was considering Enchanting on my main, since as you go through instances and WQ's you'll get plenty of gear to dischant, but I wanted to focus on gold making and gave him herba and mining instead. While double gathering sounds like a good idea for gold making i realised it's not like i can actually gather 2 things at once. i'll be dedicating my time to 1 thing, herba or mining.
Let me start by saying that I had pretty high expectations for this product when ordered. For background, I am an electrical engineer who works on products requiring high fidelity transmission of signals for safety relevant automotive application. Platting is very important for signal transmission and especially a solid bond between the conductor and terminal (banana plug in this case).

-Bugs- There aren't too many glaring bugs anymore, but you will certainly encounter some. The pathetic thing is that many of the bugs you'll encounter were reported repeatedly during Alpha/Beta and still weren't fixed. Some bugs were discovered after release and players were able to abuse game mechanics without repercussion unless they were one of the more serious offenders. This gave some players a significant advantage over others because they used exploits and at the start of an expansion, that is the time when it's most impactful.
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WOTLK and Cata were my goblin training grounds as well (I remember fondly making 30k on a single day after a patch day with Inscription), but since Im only at Legion levels, Im struggling to find oportunities where to start invest and make profit. I've been carefully paying attention to the market and picking small batches of mats to flip. After 6 yrs out im slowly starting to pick up (so far i think i made 100k in a couple of months).
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You will get the recipes for these high level armors through a new discovery system. First you have to craft the base ilvl 355 armor (normal raid ilvl) which requires BfA Leatherworking 115. After you craft this armor, you will discover a new recipe, which is ilvl 370 (heroic raid ilvl), and after you craft one from the ilvl 370 armor, you will discover a new recipe for an ilvl 385 armor (mythic raid ilvl).

A variety of people use professions in this game for different purposes. Some just use them for their own needs and some use them because their game is making gold on the auction house. This is part of the problem since blizzard never seems to be able to please both groups lately because they don't spend enough money on that aspect of the game to offer enough of a variety of patterns/recipes.
Crafting (Blacksmithing, Tailoring, Leatherworking) – When it comes to endgame, I always found crafting to be very dependent on the level of gear you can produce. There have been times when the crafted gear was competitive with the gear you could get in the open world and during those times I always had success. Then there are the dead times when the game gear vastly out levels anything you can craft. There still is time before BfA launch for the devs to make more changes, so I am not sure where crafting is going to come out this time. Whatever they do, I have always made some gold selling transmog and Blacksmithing has shined in this area for me. Many folks don’t take the time to collect old rare recipes which can leave few competitors. Transmog never sells fast, but it can work.

I'm holding a huge stock of herbs, flasks, pots, gems, fish, feasts/foods to sell when Uldir releases. Its already too close to start investing into that so I would just farm herbs and try to sell Anchor Weed as fast as possible right now when price is still high. Blizz can buff spawn rate anytime or reduce materials needed like they did with feasts.
With the most in-demand decks going for up to 20,000 Gold each, Basil believes that Darkmoon cards (12 of which when combined form a full deck) can earn scribes the highest possible WoW Gold. But he said that it takes intricate planning and logistics to really ramp up the Gold income from Darkmoon cards due to the constraints surrounding its crafting cooldown.
I'm pretty excited about where the various gathering professions could go this expansion. Crafting expansions actually have good stuff to craft to prepare for the upcoming raid so gathering items will be needed. On top of that nodes are giving out less so more effort equals higher prices. Now where this goes past launch I'm not sure but stuff like Mining and Herbalism should be solid at the beginning.