I don’t think it’s a dumb question.
The perception about the guardian cap is that they reduce concussions. The reality is that although this could be true, it isn’t proven in game use. A lot of the statistics provided reference practice/ training camp data (which are already limited in contact) and lab tests.
So to the naked eye it seems like an obvious choice for a player who suffers head injuries. For many, the potential benefit doesn’t make it worth their wild, as I know som dislike the feeling, weight and heat from the caps