It just turns one of the most fun/interesting part of the game into something frustrating, a negative instead of a positive.
The consequence to that explanation would be a fired HC. No HC is paid to avoid the progress of his team lol I'm fine with them doing their thing in the "official" matches but for the scrimmage the only concern of the HC would be to achieve the team/training goals. Like you said, lose all you want but develop the players, right? It defies logic
Anyway, enough ranting, sorry about that.
If it keeps up, I'll have to start using 5 players only and some lucky fans every now and then. Will have to consider doing what needs to be done with the rest of the team on the other 2 games, somehow.