More quasi-fact based speculation ...
Problem may very well and likely is on Nvidia's end of things. If they won't cooperate, drop support, won't give access and coordinate then there isn't a bunch the Linux kernel developers can do about it, though everyone is looking at them like it's their fault. What the hades are you people doing, why isn't this working better etc ?!?! Thus no doubt one of the things which prompted LT to snap at them. He also knew that by doing so, he was going to take flak for it and did. Having a bunch of politically correct zombies on the FAR outside, with no idea what's going on within saying OMG, he gave somebody the finger, what a lowlife !!! I won't be able to hug my favorite teddy bear or sip a diet soda for at least an hour, maybe even an hour and half after seeing such offensiveness. Is this the type of person who should be representing the Linux kernel ? YES, he's exactly the kind of person who should.
Wanted to mention but seemed like it'd be coming off as mud slinging at Debian and it's not at all proper, a given Debian stable release was long time tested against xyz-kernel version, all the software versions in it likewise tested with same. Many people upgrade their kernel without valid reason, they simply want a newer kernel version, they start trying to wedge a new one in there and could not be considering such things. The time to upgrade a kernel on Debian stable in my opinion, is if there's a good reason and then would still say absolutely get it from backports first, at the very least a source which is credible and makes it very clear whichever kernel they provide is fully compatible with Debian, preferably makes it very clear it's intended for current Debian release. I mean that would be ideal and if someone knows their stuff, other options become practical too. Also I'm exaggerating in ways too, as it's not like installing a newer kernel on Debian stable is going to make anything explode either. It's really a no harm/foul thing, someone feels like it, try it and see how things go. But if you have xyz-kernel and it's working well on your hardware, there's no real reason to upgrade right ?
Steam OS and those types surely do mucho more than most, develop and maintain stuff like Proton, specifically config for gaming, they patch, checked not too long ago and they're in the process of trying to get such patches merged into the upstream kernel but that takes time and a distro like Debian stable isn't called Debian latest-newest gaming support, whamo, bamo performance center, ... as the name makes plain, it's meant to be stable. Long time tested, long support period and stable. Though again could no doubt be adapted and tailored for better gaming performance too. It's also called the Universal OS for good reason. Something else that's pretty clear atm, I need to step awayyyy from the coffee.