If SE were to do that, I would make sure never to bring a Paladin to anything aside from Voidwatch ever (well, I do that now for the most part, but I'd be even more careful).

Simply put, on weaker NMs/mobs, Paladin takes more damage than quite a few other jobs that deal significantly more damage. On stronger NMs/mobs, Paladin has absolutely 0 issue capping and maintaining capped hate. So really, it wouldn't reap any tangible benefits, and would doubly serve to ostracize Paladin against weaker NMs/mobs.

I'm not sure where in the world people are getting this idea that Paladin is unable to generate Enmity, or has issues capping hate. They don't. It's simply a matter of them slowing the group down both via opportunity cost, and by causing the NM to look away from the Counter-spamming Monk or Retaliating Warrior.