I wouldnt make them that stupid.
It would make the game too easy. I think its enough to make some of them less careful about elemental surfaces and then maybe add a few details to specific encounters where it would make sense form the narrative or story angle.
I think its kind of appropriate that skellies who were soldiers before still remember a few basic things like climbing into better positions, especially if they are resurrected by some magic or source.
I think explorer mode already reduces all enemies stats and will probably have lesser Ai too anyway.
So that should be more then enough for those who dont want to fight seriously.
