While that’s true in theory, it’s still very common to run Debian Testing on a desktop in practice. For a user coming from Fedora, there would likely be culture shock from the dated packages in Stable. Using Stable with Flatpaks+Nix would be more usable, but OP’s experience does not sound like it would fit well with the effort/knowledge required for this solution.
I wouldn’t recommend Sid to a less-experienced user and I didn’t recommend Arch for a similar reason.