It's not a big issue for someone technically inclined, but we often lose sight of how much of a barrier things like that can be for a more average user, who is also completely new to Linux. It's not going to leave a good taste in their mouth to have to figure this stuff out right off, compared to Windows where it just works. That's not to mention the increased difficulty of installing the Nvidia driver in either Opensuse, Fedora, or even standard Debian. To someone who has never had to install a new repo or use the command-line, it's likely going to feel daunting and a big step back compared to windows, even if to us it's no big deal.
At the end of the day, Mint just doesn't have those problems to solve, and doesn't really have many practical downsides for most users, which makes it the ideal on boarding experience with the least friction, and thus the highest chance of a new user sticking with it.
Though I do think Fedora now has an “install nonfree repos” checkbox on install
Unfortunately that option only provides some non-free codecs, I still couldn't play some video files when I tried it. I recall it took installing the VLC Flatpak (and ensure it's not a Flatpak from the Fedora flatpaks repo, which bring their own problems), before I could finally play certain videos, but I already knew enough to even try that. A newbie probably wouldn't know that the flatpak version would have its own codecs bundled in, and would have to do further research to figure out why a video isn't playing even after enabling the non-free codec option in the install.