Re: Hard Fall, feeling rough.
Agreed. A motorcycle helmet is a very different thing than a bicycle foam hat. But if you're pushing pedals, it's often too hot and stuffy to wear one. It also cuts down on your situational awareness, which makes you more likely to get into an accident just as it makes the potential consequences of the accident less severe. To help offset the reduction in peripheral vision and hearing, I recommend adding rearview mirrors if you use a full face helmet.
It's probably a reasonable choice for a motorized bicycle rider who doesn't pedal, or for someone riding in cold conditions.
"When I see an adult on a bicycle, I do not despair for the future of the human race."