So you're arguing that anything invented for cars that make them less easy to operate would never be permitted? So like, have you never seen a sports car? Those are 100% irrelevant for road use but are still quite legal. They have lots of features and more you can turn on that make driving it more effort than standard cars.

And before you say, "sports cars have a purpose that call for those features". No, they don't actually. Sports cars don't need any of those features for normal road use and actually making use of many of them would cause you to be driving illegally. They are track-only as designed. But manual transmissions do still have uses that automatic transmissions fail to cover: Non-standard roads. High-grade hills, non-paved surfaces, cold-weather, etc.