Window's UI is not really an upgrade though. All the fake roots (why the heck is the Desktop the root) and the forced broken navigation therein, the removal of up so you have to navigate everything like webpages, treating some folders like databases and others with duplicate names like standard folders, hiding extensions, and the 'My Computer' naming madness.
There's "Up one folder" button and keyboard shortcut in Windows. Button is placed next to weblike Back and Forward buttons. It works according to path displayed next to it and you can even click the elements of the path to go up as many levels up as you want with single click.
That's true but annoylingly it doesn't always take you up one folder. For example If you click it from Desktop, it takes you to the whole PC instead of to your home folder.
Windows (the operating system) does the same thing. If you open your “Documents” folder from your “Quick Links” in the sidebar, going “up” takes you to your Quick Links “folder”.
It’s even worse in MacOS. No matter how much I try to use Mac, I am always so disoriented by the filesystem and the “Finder” (filesystem browsing interface).
KDE is the best desktop experience available.