There are several ways to fix this by using basic mechanics. Namely, LOS the mob. Move behind a wall and they will lose sight of you, so they'll run up to and around the scenery to get to you. Admitedly, this isn't possible 100% of the time, most notably in Anyder (lvl 80 dungeon from 5.2) between the 1st an 2nd bosses, the walls arent high enough and the mobs can see you over them, so they dont move.

But yes, i do think some jobs should get their knockbacks back again, its not like they adversely affected raids or anything like that.