Yep. I just confirmed megasync does work in X. Also, I restarted the machine because the CPU was locked at a 100% when I switched back to X from W. I launched ksystemguard and noticed two plasmashell processes running, I killed one, but the CPU remained the same, it didn't affect functionality though; desktop and mouse pointer were responsive, I could launch apps, in short, everything worked "just fine". Furthermore, I booted to openSUSE instead of Bullseye, I was curious whether VLC could play the same video there in X, which it did, so it seems it might be more of a Bullseye-radeon-xorg relationship thing. Will have to investigate that. So for now, it seems those posts and blogs are right about W not being totally ready, or at the very least not in KDE Plasma. I read Gnome is the one that seems to be doing better in that regard and in fact some distros like Fedora and openSUSE use it as default with Gnome.