>>64131307
I've worn helmets like that. They're insanely uncomfy. You can barely see a damn thing, and your breath is trapped in the helmet, which is annoying + exhausting.
You can't fight on foot with them, unless you're in a specially-designated fighting ring, because you keep bumping into shit that you can't see, and your endurance is badly reduced on account of the whole breathing thing.
I think they were exclusively for cavalry, with the heaviest closed helmets specific to sports jousting.
Infantry would always prefer open sallets, kettle hats, etc.