Do you have any evidence to back your assertion that team sport is necessary for childhood character development? How about your implied premise that team sport does a better job of improving physical health than individual sport or non-competive physical activity?

it's self evident if you ever been trough schooling, but since you want to play the evidence game let's start from a systemic study about team sport, socialization and psychological health

https://ijbnpa.biomedcentral.com/articles/10.1186/1479-5868-...

If I thought the premise was self-evident, I would not have wasted my time challenging you. The review you cited covers effects of participation in team sport on physical well-being and certain markers of psychological well-being, but you claimed that sport builds character.

Perhaps I assumed a different meaning from the one you intended, but when I hear people going on about sport building character, they're usually talking about their idea of "moral character".

This study does not test, let alone support, the premise that sport builds moral character. Did you mean some other kind of character?

social skills, empathy and understanding rules in social context. I've no idea how morality got into this.

You dragged morality into this when you talked about "character" instead of saying exactly what you meant. :)