Some kids play for a new summer team every year. no sense of "community" ever gets really established for them.
My kids have played on some top summer teams. Those teams at 17 would likely beat all but the very top HS teams 2 of 3 games. The priorities are different. School ball is about teaming up with the kids you walk the halls with, trying to beat the kids from the next town over. I feel sorry for anyone that actually doesn't get that.