Ah, the old Nvidia problem. It’s true that Nvidia’s Linux driver isn’t very good (although I don’t think their Windows driver is very good either, it just has more features).
The 3D Settings page is specific to the Nvidia Windows driver. Even an AMD user might’ve been slightly confused (although AMD ships comparable features, just located elsewhere under a different name). This is indeed something the Linux drivers plain don’t have in that form, although I can’t remember the last time I felt a need to really muck around in there.
Admittedly, overriding game rendering behavior might not even always be possible, seeing that DirectX games are run through a translation layer before the GPU gets to do anything.
I wasn’t able to find solid info for AI upscaling even on Windows, mainly because of the terrible name of that feature and because Nvidia offers both “AI Upscaling” and “Nvidia Image Scaling” and I have no idea if those are the same thing. The former seems to be specific to the Nvidia SHIELD.
Unless you’re talking about DLSS, which is supported.
The HDR one is odd but might again be related to the Nvidia driver not being very good. This should improve in the future but they are admittedly trailing behind.
This is a case of you having some very specific requirements that can only be met in a certain way, that being Windows in this case. Whether or not a switch makes sense depends on how important those requirements are to you. Seems perfectly reasonable to me.
I personally found the ability to override a game’s rendering settings to only be worth it in very few cases but that’s me. But if you use it a lot then you use it a lot.
As for AI upscaling, my main issue there is that Nvidia chose a name so generic that it’s hard to google. And then they made a second unrelated feature with a very similar name.
There is AI video upscaling for Linux but it probably doesn’t work quite the same way Nvidia’s offering does. That might be a problem or it might not; I admittedly only invested a minute to look it up so I don’t have any details.
The same applies to SDR-to-HDR. There seems to be something but it probably doesn’t work like what you currently use.
So in the end you’ll have to decide whether you’d be more annoyed by not having those features or by having to use whatever zany shit Microsoft come up with. Not a great decision but that’s life.
I personally might have stuck with Windows longer on my desktop if my 4080 hadn’t turned out to be wonky and Nvidia’s driver hadn’t turned out to be so capricious that I had to spend two months ruling out plausible error causes. That drove me back to AMD, which made the switch easy. But again, that’s me and not you.