LJ I’m not quite sure which helmets you’re referring to as not providing cranial protection? Modern helmets provide full head protection, Upper face by polycarbonate visors, lower face by either a mask or maxillio facial shield and cranium by the carbon fibre/ aramid shell. If fitted properly, helmets are not uncomfortable and provide a worthwhile source of head protection where they are able to be worn. Pitts and Bouchon are not helmet friendly, although I note the Red Bull pilots manage to wear helmets in their aircraft (and FR coveralls)?