The issue with Debian is how old application packages are, and I'm not really into Flatpak. Fedora's packages are pretty close in recency to what's shipping on other platforms.

Stability and update frequency are inversely correlated. It’s largely an unavoidable trade-off.

It makes perfect sense to me that you’d feel that Fedora struck a better balance for you.

Many people prefer Debian based distros. Some people use Debian on the desktop because they prefer less frequent updates (among other reasons).

I’m just stating the obvious here, really.

Debian testing is more stable than other "so-called stable" distros, and has often newer packages than the contemporary ubuntu version.

Debian testing puts you in a pretty bad place in terms of security updates; you're not getting new upstream releases as quickly as unstable/experimental, but they don't do dedicated backports of security fixes like with stable.