The problem is cats get no reward from catching the red dot. For some it can be a stressful as they need to catch the prey. The key is top reward them with a treat or toy once they have caught the dot. Just like humans, endlessly chasing something that gives no rewards can lead to undesirable outcomes and behaviours.
I get what you are saying, but one of my cats is really fucking lazy so the only time she runs around is to chase the damn laser pointer. Yeah I guess I could also give her treats. But she's so fat, I don't know if that's good either.
Even better is to then only feed them after this. The have a very repeatable hunt/eat/groom/sleep cycle.