Sounds like the coach should have signed up for 8U Premier Diamond Elite Fast Pitch instead of rec 8U rec softball.
So just because a player is at 8U rec they should not learn anything useful?
I am not saying there aren't different expectations for different levels of competition but the requirement of showing up to practices/games should be the same across the board. You aren't doing anyone any favors by having zero accountability. Even at 8U my DD knew that she signed up for a team sport and made a commitment to a team. On that night halfway through the season when the neighbor kids were outside playing and she wanted to skip practice to run around with them, guess where she ended up? At practice.
Set expectations young and set them up for success throughout their sports careers and life. And no, by expectations I don't mean every girl that signs up for 8U rec ball is going to be the next Aubree Munro or Monica Abbot but they can show up on time to practices, games, classes, job interviews, ect...