That being said, I run a "nightmare stack" of sorts on my main Linux gaming PC: Alder Lake CPU, Nvidia GPU. NixOS on root and Steam installed natively. For a while, it was Unsupported Driver city - Population: Me.
...that being said, games have "just worked" for as long as I have Vulkan drivers installed. Steam might complain about software acceleration, but Cyberpunk runs with DLSS and Raytracing like a charm. The underlying stack is incredible, and I think it proves that you can make Linux a reliable delivery platform if you put in the work.
That's just my experience, but look at the rest of the industry: Apple publishing Game Porting Toolkit based on DXVK code, Raspberry Pi GPUs playing Fallout: New Vegas, RISC-V getting Box86 support, the list goes on. Hardware diversity is great right now, the Steam Deck just pulls a lot of that technology to center-stage.