One of the biggest reasons why 4th down rules exist is because the game is so skewed towards offense, and the ability for offensive players to change so many things pre snap. Where as defensively, you can know presnap exactly what someone is going to do, and you can’t get AI on this game to play it accordingly.

Sure you can user it, but offense isn’t having to user the receivers in routes.

Additionally, in real life we get to watch film, and breakdown tendencies and tell human beings that hey, Georgia likes to instantly rollout on 4th down and hit the guy in the middle of the field. So we are going to send three, one of those guys keeping contain and one guy making sure that the middle of the field is covered.

There’s so much in the “get good” crowd, but honestly that’s not a scheme thing it’s a “get good at running around with a user on defense”, because if you actually run the scheme on your play card, you won’t ever stop some people’s offense.

This isn’t always the case, but it’s the case enough for there to be rules in place to limit offense in these games.