Elements to be Implemented in the March 27th Version Update

[Ziyyigo-Tipyigo]

The thing is, Restraint originally did have a down side: a critical hit rate reduction. They deliberately removed that penalty, to the point where the ability's name doesn't even make sense any more.

If "BALANCE!!111!!" were as important to the game as you claim, they'd have at least found a new penalty to restrain Warriors by now.

And yes, there are /ja's with no down side, but note that none of the ones you listed are for WAR (except Restraint). It's clear that the original design intent for WAR was to play with trade-offs (Berserk, Defender, Aggressor), but that has apparently been abandoned.