I think I can definitely see that in Prompto. He seems incredibly excitable, but it's not necessarily a bad thing.

[ Sometimes that's what a group needs - someone to help keep them together when things are getting harder and harder. She knows that from experience, dozens of times over, and it makes her feel ridiculously nostalgic despite her youth. ]

I don't think his lack of experience makes him any less good at what he does, though, does it?