Why? The current design puts Quest Hunter at a very reasonable 55% win rate, solidly in Tier 2 according to HSReplay. The difficulty or timing of quest completion doesn’t matter; what matters is how it translates to win rate.
Now if that win rate changes with the new expansion and we see a win rate far higher than the rest of the meta after a few weeks, then you might consider a nerf. Right now, the only reason you want it nerfed is because you feel bad. That’s a terrible basis for design decisions.