I read this a lot as well, and I think for a time this was true, but in my experience with a 1070 and 1080ti, Ubuntu and Fedora worked fine with minor tinkering, pop_os and nobara work out of the box. Currently on nobara, and most apps and games work just as well if not a little better than on Windows. A mate of mine runs nobara with a 3080 and no issues there either.
Fizz