Lift chair bars. Tourists swinging skis and poles. Falling in the shower. Bonking my head against the boilerplate when I get stupid. Brain injuries are cumulative, so having popped out a windshield in my youth I can't afford more bonks than necessary. Do as you'd like, just don't come flying out of the trees at me, as there are other parts I'd also like to preserve.
If my helmeted head hits something hard enough I could still die from brain shaking. However that's a monumentally hard hit. Hitting my helmeted head not very hard will save me from a bump. For anything in between I'd rather have a concussion than a dented head.
I like my brain. It makes skiing funner.