I was with you right up until the end... I have a Steam Deck and it's absolutely incredible. Support, though, even for the verified games and with nothing modified, is hardly at the level that it is for Apple products and actually using it is nothing like using an Apple product.

As soon as someone has an issue with something that's not officially supported by the OS, Steam/Valve is not going to help them. There's a reason why it's impossible to build something like this for Apple. They don't want any devices that they can't support until they're past their life cycle.