I use a Linux distro with kde, so I have a lot of customization available. I like trying other distros in VMs, but stuff like windows (no need to copy really kde is similar by default) and Mac is a pain in the ass to use that way. so, I want to know what your os does that you think I should copy using kde’s customization. I’m looking for Mac in particular (bc I haven’t used it before) but any OS or desktop environment is fair game.
I used to quite like the Unity desktop for all its quirks and how the panel would merge with maximised title bars. I do that with KDE Plasma, a global menu, active window controls, and a bunch of command output widgets for CPU usage and things like that. libadwaita-without-adwaita and gtk3-classic help to theme the stuff Gnome tries to force the look and feel of to be consistent with everything else. Another tweak that I have grown accustomed to is editing the Firefox userchrome.css. It means I can even make that fit in with every other application too. Search Github and you will find loads.