Here’s a list.
1: Profession gear being a vast improvement over gear you get from drops. Vastly superior to anything you can get in raids and even beyond the possibilities in mythics, without having to do mythics or raids unless you want to do them for fun.
2: A revamp of Horde racials! Blood Elf Arcane Torrent turned back into a silence is the best step forward! Extend the duration of Tauren Warstomp, and make it so Tauren can choose the option to punt. Like Kul’tiran haymaker, but instead of a stun it have a slow or snare.
3: Flying AT THE START of the expansion instead of the deathbed! I’d rather be stuck leveling a character on both factions than have to grind from the ground in a snoozefest just to wait an intolerably agonizing wait to get airborne!
4: A proper bridge in the barrens to connect North and South barrens! That way it’s less trouble for players who are leveling!
5: Fixed stat templates in PVP. Make it so PVP gear can have an influence.
6: Class gear that looks good!
7: The ability to mog feloh’malorne(Flamestrike) as a blood elf regardless of class!
8: Gnomes getting their strength, stamina, and agility stats reduced by 33%. They already got the anti-slow racial in escape artist, so mobility isn’t an issue since they can break out of it!