Yeah, the thing is that it's not so rare anymore. Just ran into Ur-Khan with the same issue, although this time I was arguably not ready for him with his standard equipment. I fought him head on and he did some serious damage, so I'm pretty sure he would've killed me otherwise. In any case, I think no enemy should spawn with disenchanted gear ever, and specially not the named ones. The limit should be regular gear with no enchantments if the game had to scale its danger level down.