Increase healing across the board by 50% and damage for mistweavers by 75% and for any damage converted into healing, make that multiplicative or whatever produces the best numbers.
Convoke should have been a monk ability that also gives monks immunity from CC.
Fists of fury should be able to punch through walls and rocks so that terrain is a non issue. I should be able to punch trees in Korthia and knock down bird nests.
What buff would you like to see for your favorite class?
Play orc if you want a buff monk. Panda too soft.
Nothing tops being strongfat though.
Mind Control should be permanent and make shadowpriests a pet class.
I want to crush the minds of my enemies and keep them in stables until I have use of them.
I want Warlocks to have the talent for permanent Infernals and Doom Guards, again. I used to have an infernal named Flameflame, but lost him when the talent was removed. I miss Flameflame.
RIP Flameflame 
Demonology needs to get Metamorphosis back.
Windwalker needs Way of the Monk back, and needs to be unpruned back to its WoD iteration so it isn’t a brainless AoE nuke spec.
Frost DK needs to be unpruned so it isn’t three buttons and has a larger skill spectrum.
That would have to be a pretty big stable.
REBUKE
and judgment generating holy power
Omg please just give all healers interrupts. All the good DPS quit WoW and the ones that remain don’t know how to use abilities that don’t do damage! Every single one of them with not one exception!
I have not played my paladin long enough to know what it was like prior to BfA.
I like this and then stopped and imagined the loud mouth of the group; heals why you no interupt after they get bursting stacks high as hell and you used revival on the last group that they did the same thing.