Initially I didn't like Fedora Flatpaks, but they have grown on me. What I really like about them is how they are built directly from Fedora RPMs.
Unlike Flathub, they don't pull and build dependencies directly off the internet (which may not get timely updates). Instead those dependencies come from Fedora's repos.
The way Fedora Flatpaks get built are also much more consistent since they just use Fedora's infrastructure. Meanwhile flatpaks on Flathub may be repackaged Appimages, snaps, tar.gzs, built from source, etc.
Though there is the obvious downside of Fedora Flatpaks which is missing media codecs. So if an app needs codecs, I just end up using Flathub versions. And Flathub for whatever isn't in the Fedora Flatpaks repo.
Nah, I don't want to risk accidentally getting a codec-less version, they never worked for their intended purpose in my experience, they're basically bricked.
Mind you, the vast majority (if not the entirety) of what I interact with uses non-free codecs.
I honestly kinda wish someone made Fedora, exactly as it is, with the exception that it has non-free codecs pre-installed and available without having to faff.
I think Ultramarine Linux is close to that. Unfortunately their site doesn’t make specific mentions of all their changes.