don't judge crash pads without having ever worn them or even seen them. Honestly, my skeletools (one of the bulkier ones used for dirt bikes) is super comfortable, light weight, and really good protection. i usually forget i'm wearing it. + no wet butt. can't see it under your pants either
I got it because i live on the ice coast and they really do help a lot, giving you confidence that if you screw up, you won't get fucked too bad. I don't think many people wear upper body armour but having a helmet/knee pads/ or hip pads is definitely a big confidence booster. better safe than sorry.
also, you are way more apt to go for bigger things if you see your friends stomp the shit out of it.