Counter to overpowered loot: Auto monster scaling/modify weapon reqs

[GeneralDiomedes]

I want to sneak around a corner and see casters renewing buffs of the baddie melle types.......a group of orcs with stoneskin already cast....and hearing the sound of the shaman renewing an occassional fire resist.
This is the way to make more challenging content.

Or have the enemy spellcaster switch spells according to context. They shouldn't even try to cast Hold Person on a WF or a summoned pet, for example.