The Raspberry Pi Foundation has released the stable version for their PiOS 64bit.
I've been using the (officially unsupported for RPi4) Fedora Workstation 35 aarch64 on a 2Gb RPi4 for quite some time now with no major issues.
To get it to run smoother I tweaked a bit because of the 2Gb ram (lxdm, fulxbox and /tmp on filesystem)
Is it not about time Fedora officially supports RPi4 ?

Are we to assume you have read this ?.

FWIW I found Fedora a little behind the ball when I got my pi3s, so have never actually used them on ARM, but can understand their reluctance to commit development resources.

When I first got my RPi 4B 8GB I tried fedora. At the time I think it was Fedora 33.
I only encountered one error and that was related to a firmware for the video that was not part of the linux-firmware package. I seem to recall that it may have been something like the v4 package or similar related to the graphics chipset on the board. At the time all I had to do for the system to boot and operate properly was to uninstall that package so it did not block the graphic boot. (I could boot to text mode so was able to work from there and the logs showed me where the graphics boot failed)

I did file a bug on fedora's bugzilla and reported the successful workaround but have not continued with fedora so have not followed up.

I instead switched to ubuntu and have been running ubunto 21.10 successfully for some time. Planning to switch to 22.04 LTS when it is released.