Agreed! I hate that we can hide the helmet during dialogue but it doesn't stay hidden during regular gameplay. The helmets have a lot of good benefits, but I'd much rather see the faces of the characters than see a stupid helmet.
Oh, that you can do. Only need to click that tiny button one more time. (It hast 3 options: show always, hide in cutscenes, hide always)
What gets me, is that the chosen option is forgotten the moment you tell said companion to stay in camp...
Especially seeing how much effort went into animating all their face and facial expressions this really, really irks me. *sigh