I don't want to over dramatize this because I haven't seen every team or every kid but from what I have seen at the squirt and peewee levels (changes as they get older) these teams do struggle to play a team game. There is a lot of puck hogging, selfish play, skating down the boards with heads down, over decking, and it works well against medium to high talent and they lose against the elite talent (which is why despite being ranked in the top 10 they feel a need to bring in outside help as the kids age).
That being said the kids are very skilled so it does work sometimes. A lot of this may be driven by the fact that ever kid feels they need to be the best in order not to be cut next year and kids measure best by how many goals they score not how many times they attempt passes or play defense.