Coincidentally they seem to have more issues in relation to their crowd than a more well adapted, "unpopular" crowd may. Unnecessary drama, friendships built on absolutely nothing, etc.
i am def in the popular group at my school and pretty much everyone is close af and we dont really have problems. probably like 30 kids in the group in out grade, then kids from other grades too. occasionally there is some drama when like a couple breaks up and they dont want to talk to each other but i mean nothing big. some of the chicks get in fights sometimes but that happens in every group.
plus i mean the popular groups rarely actually separate themselves completely from the other groups. i mean there are obv some huge differences in some areas but for the most part, the majority of our grade knows/socializes with each other. there is like the weirdo nerd group that has that "pff we're better then them" and removes themselves from everyone else, and like the outcasts who are just kind of anti-social, but still.
im not saying our whole class is one big happy family, but this whole "just a bunch of meaningless friendships" thing is pretty false in most cases.