I moved to Fedora kde. Smaller, newer packages(kde 6), and wayland updated.
There is no reason to fight Ubuntu, just pick something that is not against your priorties. I came from Windows 10 and there was a lot of fighting for respecting user choice.
I am against container as they are slower to start and much bigger. I think they solve the problem the wrong way. Next step is probably a VM…
Firefox have always been possible to run without container so what is the problem for all Linux distributions that containers solve? Nowadays developers have do to both… That did not less the load.