The current system does allow for Allies to help out, I was in the GMS compound on my last playthough, ran out of ammo, ran away from a 'hound and back down the corridor that runs past the vault. Gorksy ran out into the corridor and killed the thing. So you can have allies helping you, so your not always alone.
it would be nicer though to have in parts like that, an AI ally to maybe patrol around a bit inside the compound, or at least walk over to the elevator, giving you the impression that the AI isnt just utterly dumb