Okay so here is the game, you get to change one thing in any aspect of the game but it has to be something really minor and petty. No class changes or major mechanical type stuff.
Mine would be that you can hide the world quests in your major cities. Such WQs as ore turn in type quests. I absolutely hate that I can’t stop tracking those.
Anduin would be cannonically my boyfriend
Remove EXP bonus from heirlooms.
All gnomes will be puntable.
Being able to skip the cloak quest on alts -.-
I’ll go with what asmongold frequently requests, boob slider/options. enough said.
More awesomefish so i can make everyone day 
I was so excited when I was told there was catch up for the cloak.
I lost it all when I heard you had to be over rank 15. I’m 8 and hate 8.3
All races now have access to silly mustaches
You can kill your own faction.
removal of exclusive limited time events. whats added stays
No race and class gating. You can be anything you wanna be. 
This will probably fall under “major mechanical”: All doorways are either big enough or don’t clip at the top that any race can run through them on any mount.
Heck no, so the Wrath prepatch event would have been going for 12 years? 
O-M-E-G-A Y-I-K-E-S
No more required jumps in dungeons or raids. Siege of Boralus is abbreviated SoB for a reason.
I dont think its too much to ask, with all the new cosmetic options, to want to change the polish my lady elf wears. I want sky blue or black fingers and toes darn it!
you quoted my “had”
I feel hurt and offended
Lol sorry, I am using the forums on my phone 
Given that most unwittingly see the cold corruption of Void Elves as a minor inconvenience I will make them my choice.
I shall forgive you… this time… XD