There are several reasons why this may have happened. First, only a fraction of the players who interact with the auction house buy or sell WoW Tokens. While the value of both gold and commodities plunged relative to real money, the value of gold and commodities remained steady relative to each other. Players who didn’t interact with the Token market could buy the same number of flasks by doing the same amount of world quests, or selling the same number of gems or enchantments, so these sellers saw no reason to raise their prices.
You should try and quest efficiently - pulling several mobs if you can handle it, using your burst cooldowns while questing to kill everything faster. Many people would think that a 10-minute cooldown like Bloodlust is useless in open world, but you can do a "kill-15-mobs" quest in like 30 seconds if you pull a lot and use it. A free quest every 10 minutes is not that bad.
The community was apparently frustrated with Blizzard for a lack of communication concerning the issue, but it looks like that was due to the fact that their heads were down as they worked to understand the problem. It was explained that they didn't want to just roll out a quick bandage, as that would likely cause unforeseen issues down the road. Instead, they're crunching the numbers and digging into the code in the hopes of discovering a legitimate source of the problem.
Fifth: World Quest are back and are still important for leveling your Heart of Azeroth and gaining rep. I do recommend you do these in Warmode for the additional bonuses but if you don’t like PvP I would at least suggest doing a clear of all the quest that don’t give AP in Normal mode then going back and clearing the ones that do give AP in Warmode for the bonus. Emissaries are back and work the same way though it is very important to hold off on any emissary quest that gives you gear until you are at least 310 item level. Once you hit 310 item level, the reward jumps to 340 loot instead of 325? (its somewhere around that area). Try to delay these the best you can, but don’t risk missing out on free loot.
Edit 20 It’s been a week since this post and a lot of people are still reaching out to me with questions which is fine. I have had a few different people reach out to me to help make YouTube videos based off this guide and more info in BFA which I’m more than willing to do. Whoever gets the videos up first I will link them here for you guys to enjoy.