> bluetooth on Ubuntu

    apt install linux-oem-20.04c

The 5.13-oem kernel fixed a bunch of niggles for me with bluetooth, an RX 5700XT, CPU temperatures, and USB audio. (The last is still not all the way to where I want it, but that's down to it being really hard to figure out how to tweak Alsa.)

I agree with your assessment. "Fine" (with the quotes) is about right.