As long as the Steam Deck remains popular, game developers do have an incentive to make sure their games work acceptably under Proton. I don't know why you thin

As long as the Steam Deck remains popular, game developers do have an incentive to make sure their games work acceptably under Proton. I don't know why you think this isn't a viable long term strategy, the Win32 ABI is incredibly stable which is exactly what makes wine/proton work so well.