Yes, that may be the case, but that comes with its own downsides as well. The most recent version of SteamOS runs the 6.1.52 kernel from September (thus it should be unaffected by this bug, since it was introduced in 6.6.30). I don’t follow kernel changelogs very closely (so I don’t know all the new features and improvements that are being missed from new versions), but there are lots of optimizations and new features constantly being added to the kernel. Of course, the tradeoff is that you don’t get new bugs, but you also have to backport bug fixes or else you’ll have the bugs present in your current version for a very long time (often the kernel devs do this, but depending on what version a given distro uses, the distro maintainers may have to do it themselves). It’s not as big of a freeze as Debian based systems (EDIT:Some of the time; right now they are technically behind Debian on the kernel minor release, but in SteamOS 3.6 (which is in beta), they will be updating to 6.5), of course, but it’s a choice that has tradeoffs. Different people will subscribe to different opinions on kernel updates, given that no one way is clearly superior for user experience and features alike.
As for proprietary packages that are held from Fedora for copyright issues (media codecs and Nvidia drivers, for instance), there are always uBlue images like Bazzite, Bluefin, and Aurora that fix that. One of the very few stipulations to the Red Hat sponsorship for Fedora is that they do everything possible to avoid legal trouble, hence why those packages aren’t included in the base repos or installed by default. It’s a small caveat that disappears once you install the correct packages.
I think SteamOS is by far the most optimized OS for the Steam Deck, but I don’t think it’s very useful to use it on any other hardware (there are better options). Kernel updates will always be a point of conflict for at least some people regardless of what model you use, but I personally appreciate the quick turnaround for major kernel versions in Fedora. It’s actually improved my experience on my laptop significantly, as there have been recent changes that apply to my specific hardware (in some of the 6.6 releases, for instance). Of course, anyone can be free to prefer a slower rollout, and that is equally valid. The bug fixes for the issue OP is having should be backported to 6.8 anyway, so it shouldn’t necessitate waiting for 6.9 to hit Fedora in a few weeks.