Your dogwater arguments boil down to “it should support this specific configuration and fuck everyone else”.

No, because Steam ships Steam Linux Runtime in all configurations. Everybody with some insight in that topic knows that.

How is that different from a game being restricted to Windows?

Windows is an entirely different operating system, duh. Game updates break Proton all the time, take longer to load, on installation they execute super slow installation scripts, etc. If your so knowledgeable as you claim with your condescending tone, you'd know that.

And how exactly does that solve the issue of still dedicating significant effort to support an even smaller set of devices?

Steam Deck is the market leader in PC handhelds and 3rd parties like Lenovo adopt SteamOS.

Actually, don’t answer that.

I opt to ignore that order you're in no position to give.

Your comment is proof of your remarkable ignorance on the topic

You confirm that you have absolutely no clue about Steam Linux Runtime and how that is a more stable than an ever changing cat and mouse game of Windows updates, Proton updates, and game updates.

and anything else you have to say is a waste of everyone’s time.

Nobody forced you to reply to me. Next time, I suggest you read up on Steam Linux Runtime and Windows games braking Proton with updates.