Since when is FSR the standard, or even a standard at all? A part from AMD using it.
Also, in my experience Nvidia works just fine on linux, you just have to install their drivers. I literally never had an issue with them, and I use it professionally and for games. AMD is probably better if you want bleeding edge updates or use a rolling release distro, but the downside is that you still have to contend with some weird driver issues that aren't magically fixed just because the code is open source.
While FSR isn't a standard, AMD at least put effort into getting it working on competing Nvidia cards.
Yes, things mostly work when you install the Nvidia Linux drivers. But even on a Ubuntu LTS I've had updates break the Nvidia driver, sleep is a 50/50 toss up whether it resumes broken too. And that's on my desktop and ignoring the giant PITA of using a laptop with hybrid graphics. Using the Nvidia drivers also greatly complicates using a Libre distro like Debian or Guix because obviously they're non-free. Plus until the past year or so Wayland has just been essentially a non-starter with Nvidia even with drivers because of their choices.
I agree that you shouldn't use nvidia if you want any distro that prefers libre software. For most regular users it's just fine, except for wayland as you said. I wonder if nvidia has any plans w.r.t wayland support. Everything still works with X but wayland has finally shaped up to probably displace it.
The one major downside I'm experiencing using an Nvidia card (980 Ti), is sleep/resume not working. eg at resume time the screen rarely powers back on, then the system hard locks with the kernel traceback indicating an nvidia problem
The whole power off/power on thing instead doesn't take all that long, but it would be more convenient to just have a working sleep/resume.
Also, in my experience Nvidia works just fine on linux, you just have to install their drivers. I literally never had an issue with them, and I use it professionally and for games. AMD is probably better if you want bleeding edge updates or use a rolling release distro, but the downside is that you still have to contend with some weird driver issues that aren't magically fixed just because the code is open source.