Agree, but you left out lots of other atrocious adult behavior in youth sports. Speaking badly of other kids in front of their kids, ranking kids on the team in front of their kids, making fun of other kids in front of their kids, lack of loyalty, lack of commitment - if something isn't exactly how you think it should be leave it - not referring to legitimate cases of unsafe situations of course, or individuals moving between seasons, but lots of moving for "better teams" or in the middle of a season and in strategic clusters as the OP described.
And then we complain that the youth these days are entitled, lack perseverance, and are bullies, etc. etc. .....
There are of course authentic, fun, ethical parents that we have met and have become friends with but plenty of experience with the others too.