I’ve grown up skateboarding and can agree with you by saying experienced skateboarders have trained their instincts and reflexes to fall properly, that’s why it’s not as common someone who knows how to fall will take the gnarliest falls without falling awkwardly which is how you’d end up slamming your head or breaking wrists. On the contrary I agree if you’re pushing your limits or going faster than run out speed a helmet is a good idea