Right - but the proper way to gauge reasonableness of the proposed date IMO isn't to compare "we had X trapped players before, we resolved them with this date change, and now have almost none". It's "we had X trapped players before, we resolved them with this date change, and now this many are left (with a 6/1 - 8/31 early birthdate). Of that subset, 95% of them are "cheating", and 5% of them moved in to a district with a later cutoff date than when they first entered school. Is it worth making the accommodations necessary to deal with / reward that subset, or not.
Lacrosse, being private-school heavy, and by all accounts a much wealthier sport than soccer, evidently thinks yes. I'm not sure it's the same calculus for other sports.