I’ve noticed this when watching a lot of great players. Many of them curl their pinky when they play, even during the fast stuff when the pinky is not immediately needed. In fact, I struggle to think of any players that don’t curl their pinky. Here’s some images of varying quality displaying what I mean.
When I play, my pinky is usually stuck straight out, neither hovering over the fret board nor curling up into the palm. Is there any technical benefit to doing this? Or is it just for comfort? When I look this topic up online, all that comes up are questions about how to straighten it out, but the curl doesn’t seem to hinder these guys in any way. Any speculation would be appreciated.