I tried to back up the varying opinions with a couple of hastily-found examples, but what I also discovered was the “win at all costs” line was very prevalent in the U.S. but the “everyone’s a winner” approach was a very British thing.

Both sides of the pond agree on child obesity being a problem though

If you haven’t already read it, though, I’d really urge you to read Howard Chudacoff’s book “Children at Play: A History of Play in America.” I recently re-read his first chapter – all about changing social attitudes toward play, and how children always manage in the end to subvert or co-opt adults’ efforts to control or regulate play – and think you might like it. Can post excerpts if you like!