While I completely agree with you. I do think it bares nothing that the USWNT doesn't routinely lose to boys high school teams. They notoriously did lose to a very high level 16u or 15u club team out of Texas one year. There have been other instances, but it's not like it happens every year. And I don't think if you had a scenario where if you put a million dollars on the line, the USWNT would not lose to any but maybe all of the very best and older boys club teams.
But yeah, your point of there just being huge differences in athleticism very much still stands.