DLSS doesn’t run on older nVidia hardware either as it’s designed to utilize the raytracing and tensor cores of the RTX series. I recall reading somewhere that while it could technically be made to run without them, without the specific cores optimized to do the calculations required it would run terribly. Then again it might just be a blatant lie ¯\_(ツ)_/¯
FSR on the other hand is designed to run on standard GPU hardware and seeing as the tech is open source they can’t exactly hide any code that would break compatibility with nVidia.
Also because you can always lower settings or throw better hardware at the problem on PC so even a badly optimized port should eventually run acceptably. But if you fuck it up on console, you get Cyberpunk on the PS4 and have to spend a ridiculous amount of time and money to make it work.
And this is Bethesda we are talking about, at this point I wouldn’t be surprised if the PC versions are designed from the get got under the expectation that the modding scene will come to the rescue and fix everything for them no matter how terrible their work is.