Because Blizzard doesnt work with retarded logs.
Blizzard balance is for progression, what someone does for logs is completely irrelevant.
Every player with half a brain and some raiding experience knows that logs are skewed INSANELY, thats why you ignore every log apart from progression logs.
But this is WoW 2019, where knowing basic math and reading a log is hard.
BM hunters have always been last and will always be last because they are the only class that can have 100% DPS uptime even while making coffee in the kitchen, which is insanely important for progression and obviously looks back 2 months after when everyone got new gear, and they stand IN EVERYTHING AND PLAY PATCHWERK fight in order to do a log.
There always some outliers, like Boomkin and their AoE, Shroud of Darkness gimmicks and DH utility in this expansion, but its simple.
What the 0.1% does, does not affect the other 99.9%, and they arent gonna change things because of the 0.1%.
https://www.warcraftlogs.com/zone/st...t=90×pan=1000
You can see 20 days ago where people were still progressing how every class is in the 10% (Apart from BM hunters but the reasoning is above), now that they arent and they can start the gimmicks, things are getting skewed.