The rush to new things is exactly why Fedora works well for you, but there is no need to rush. What exists works fine and continue to work for the foreseeable future, and work is being done to continue working with new technologies in the future too, but there is no too late at this point. Rushing to implement new technologies is kind of Fedora’s big draw, but in exchange you have to do a complete system upgrade at least once a year and deal with any fallout if things break or don’t work the way you want them to (less an issue with atomic desktops). I appreciate that Fedora exists to do the incubation, and routinely deploy their changes (well documented in the FesCo approvals) onto Linux Mint.
Ubuntu base is optional. Debian base also works fine, though a little less polished on the Debian side. “Better desktop” is subjective. I think Gnome’s workflow is atrocious and KDE is extremely cluttered and buggy, but if people want to use them it’s fine.