I’ve thought about this before as well. It likely occurs because more people are now pedaling to the top (instead of shuttling), and don’t want to haul two helmets.
I’ve thought about this a lot. I want to wear a full-face but I only want to wear one helmet. I’ve never tried pedaling for long stretches in a full-face but my guess is that it would be less comfy.
It would be cool to have a “hybrid” helmet with a full-face segment that slid up under the visor or something. You could slide it up for open-face use and then snap it down for DH. Kind of like these for motorcycles:
I completely understand the climbing aspect. It’s the descent that I can’t understand. Again, same trails formally considered DH worthy are now being ridden with open face. To each their own I guess.
It could be less about the trail and more about how one rides the trail. The Enduro bikes nowadays are super capable but I generally dont attack a downhill as aggressively as I would on a full DH bike. But of course having said that its still just as possible to jack yourself up while not attacking at full speed. Im sure XC dudes ride “enduro downhills” in a half shell and lycra, though =)