Hi, I understand what you mean but here is my answer :

- motion sickness is in majority due to virtual locomotion, and virtual world apprehension, not only because of frame rate. Yes a higher frame rate can help in some dynamic games, but dynamic games are not really recommended for beginners. Anyway, today and by default, 90-95% of the games run at 72hz which is still the basis refresh rate even on very popular games. More and more developers tends to implement 90Hz but almost only on Quest 3. But beginners also play on Q2 for example. So if the motion sickness was very impacted by refresh rate, you could imagine that meta would have forbidden 90% of the games.

- each games are different, that is why I can spend hours and days to optimize one game. And even many low quality or low res or low poly games can't handle 120fps because it is too heavy to handle by the Quest 3. So, with a "Enable 120Hz mode for beginner" button, it will not be a magic solution and instead of having smoothness games you will end up with laggy games and that will be a very bad idea and experience for beginners. If a game run at 120Hz but the headset is not capable to render 120 images per seconds, even with boosted CPU and GPU, you will end up with lags. So, this is a good idea but it's not feasible unfortunately.

I hope you are okay with that :-)