Because to be perfectly honest it does a crap load of damage for something that can't be interrupted(obviously not counting stuns/knockbacks here). I've lost track of how many times I've practically one shot someone with precision slash into master strike and finishing them off with blade storm. Will I miss the 8% buff? Hell ya, but I agree that it needed to be removed from sentinels. It's in the first tier of immortal for juggs and I agree with it staying over there as vengeance relies much on ravage damage and they don't have precision slash like combat does.
Yeah but this coupled with the change to ataru form hits proccing our scream crit only 30% of the time now is pretty stupid.