Like I said, engineering is the best when you aren't worried about making gold. The Loot-a-rang is super useful, nitro-boosts are nice when they don't fail, and the glider cape enchant is nice too... you get wormholes to Pandaria, Draenor (make sure you have a glider), Legion, and Argus (as well as a couple old world teleport locations)...Jeeves (and to a lesser extent Reeves) and MOLL-E are also super useful (bank and mail access anywhere, repairs, etc.).
BfA is bringing the standard new profession items that you'd expect like flasks and potions, armor and weapons, gems and enchants. This BfA professions alpha preview is instead highlighting all of the cool extra items that you can craft with professions in Battle for Azeroth. BfA Tailoring is getting Battle Flags, which seems to be a sort of buff banner. We look at BfA engineering items. There's one new profession crafted mount on the BfA alpha so far- but split between Battle for Azeroth engineering and a BfA blacksmithing recipe!
How much effort are you willing to put in? The days of clicking the mission table and collecting a big pile of gold a few hours later are behind us. Our gold-making options for this expansion are pretty much just farming (materials or rare drops), flipping, and professions. All of those things are a time investment. If you're not willing to do any of those things, you're probably not going to increase your income.
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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.
Professions skills are split between expansions now, you'll have a separate skill bar for each expansion. There are still 950 profession levels in total, just that there is no one single progress bar with 1 to 950 for it anymore. Instead, there are 8 separate progress bars. (The only exception is Archaeology, because it will still have a 1-950 progress bar)