Even if Valve and Steam is great and overall a blessing for the PC space, I don't like the direction they take with this controller. It only works with Steam, it can't work on a desktop OS without it, despite standard layout. It is a subtle move towards a walled garden.
I'm not entirely sure what you mean by this. Operating systems don't typically include drivers out of the box for every single interface that could possibly connect to it. Often you'll get 'generic' drivers on Windows that at least map some of the basic inputs, but up until like late Windows 8 iirc Windows didn't even include that. Previously if you wanted to connect ANY controller to your PC you had to install third…
In practice half-assed HID drivers by OS, badly designed OSapplication APIs, hardware manufacturers copy pasting HID descriptors from other devices, not following the standard properly, firmware bugs getting fixed with drivers instead of firmware fixes, intentional discrepancies from standard, console manufacturers reinventing the wheel has lead to the current mess.