I want to switch to another DE on Fedora, from KDE to COSMIC, is it possible to switch in some simple way, kind of with rpm-ostree or something? I’ve searched the web but only found info on doing this with Atomic desktops, but I’m not using one and not planning to yet
Don’t uninstall it before you’ve tested cosmic. Just select the Desktop you want to login with, make it default. When you’re comfortable with it, you can think about removing Plasma.