I think matchmaking should be done on a per-game basis (or at least it’s a different issue.)
I’m more referring to how players connect, such as having friend lists, joining those friends, and the profiles we see in and out of games.
This protocol looks interesting, and I’ll have to learn more about it.
I don’t know if you’d call that skeuomorphism, and we have icons that are similar.
I’m not sure what you would call the opposite of ‘flat’ in terms of these designs, but I think that’s what you’re referring to.