Run your own instance or join a permissive one if you don’t want your instance to moderate trash away.
What you’re describing is a massive downgrade, and also massively adds to the legal exposure of hosting an instance, because you’re serving everything any user of your instance sees. Being able to block bad actors isn’t really an optional feature. You’re effectively asking for your instance to be forced to serve you abusive content.
It would be a waste of time when no one would use the half ban. They’re banning users because they don’t want to serve whatever they’re posting.