Lmao, c'mon dude. Many companies are, in a literal sense, doing it, I gave you an example of one. Splitting hairs about the definition of DRM misses the point that it's treated as a separate thing. I was also only making the point that it's the anti-cheat that stops the games from working rather than issues stemming from compatibility layers, getting your panties in a bunch because of the mere theoretical possibility of removing anti-cheat from a game is ridiculous.

Proton can be used for software outside of Steam (though isn't designed for it) but is made up of open source components that definitely can be used separately from Steam. Proton is a Codeweavers-led project and the vast majority of the improvements Valve and it's contractors have made to Wine and it's supporting projects that Proton rely on have made it upstream. Steam Deck is selling extremely well and major publishers are testing their games and making changes specifically for the platform. Steam Machines was a decade ago, the state of play has changed.

You didn't say DirectX was a big deal, you said 'DirectX has no Linux equivalent'. It does, it's provided by Wine and it's supporting libraries wrapping DX and D3D API calls to SDL and Vulkan. Feature parity is strong and performance is in the same ballpark, as it would need to be given the software is being developed in mind for an anemic mobile AMD SoC. Though in spite of that even DLSS and ray tracing works on hardware that supports it.

I call bullshit on you paying attention, you're saying too many things that are provably incorrect.