Blizzard need to kill professions off as a core game element, because professions stand between players and the portal of an instance. They have been doing it since Warlords. Professions also provide one extra level of player choice and freedom that needs to be tightly contained; they don't want people having to buy enchants and gems beyond what is necessary to keep some pretense at existence.
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.
-Azerite Gear- This has been the worst experience for many players as it was advertised as offering the player many options for customizing their character but all players do is Google "Icy veins (Spec/Class) azerite ranks" and select the best one. This is expected and really only gives players the illusion of choice as they're always going to pick the best one. This could have been done far better by not offering necessarily just damage increases in traits but offering some of the Legion Legendary item effects in Azerite slots. You know, certain Azerite traits would be better for PvP, some for raiding, some for 5 mans, some for soloing old content, etc. The other problem with Azerite gear is that it's locked based on you grinding an endless amount of Azerite for your neck piece (basically the stuff that increases the level of your neck piece). So when you get an item that should be an upgrade, it really isn't because you don't have all the traits unlocked. This complaint about how horrible this system is could go on forever, but I'll just leave it at that, horrible.
Even then, margins are much better if you start with ghost iron ore, smelt it and transmute it with a transmute master. Every trillium proc is an extra 500g free, every LS proc is an extra 3000g. If you're just buying 30 living steel there is no profit when you account for jards energy sources being about 700g a piece on some servers. 4200 Ghost iron ore is what you need. Arrange your toons with professions to max that out.
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In a few months only mats will be worth anything. At this point we have people with tens of millions of gold and people with just a few thousands. A flask takes tons of mats to make, and they will sell for well over 10k gold each, so the casual players won't afford them. When people realize that the rich guys will always take buying from the AH over farming their own mats, the prices will go even higher, then casuals will notice how expensive flasks are, and they will pick up alchemy and make more flasks, driving the prices down again.