It wasn't gms that decided to nerf aran/evan/kaiser. This game was made by korean developers, so they make the decisions.
"Oh well, this is gms! We don't have to follow korea, we can rebalance on our own!" Yeah, just take a look at jett.
If we keep some classes different from kms versions, it can and will cause problems with future rebalancing. So it is much wiser to simply listen to what kms tells us to do.
So, for that reason, whining here is quite pointless. If you truly want the nerf to be reverted, then learn korean and speak directly to korean developers.