Not true. If you just need a model to learn the physics and not all the pixels I am sure you can get a much smaller model. If you look at the metnet papers sim

Not true. If you just need a model to learn the physics and not all the pixels I am sure you can get a much smaller model. If you look at the metnet papers similar approaches have been successful for weather prediction where models have better results and are order of magnitude faster at inference time compared to numerical models. Of course, training will be time consuming and resources intensive, but it's something you can do once and then ship it to users when they install / update the game.