>>105568846A DE isn't just "all GUI software" indiscriminately.
A DE is the collection of software that has something to do with the "Desktop Environment", the well defined definition of the work flow around icons and a desktop.
RegEdit, and Control Panel are configuration utilities that can be used to configure some parts of the desktop if they exist. In my case, they don't.
You do know that there's other GUI workflows that are not a DE right? Do you think i3wm runs on text mode VGA? It ships it's own graphical utilities as well. It renders pixels rather than text on text mode VGA. If I were to go by your definition. Any linux environment that is not a text mode VGA tty is a fucking DE.
DE is a well defined workflow. It doesn't mean GUI. Windows is a GUI first OS, unlike linux. On linux, windowing systems like wayland and Xorg run over the OS (that includes the tty shell and the kernel), on windows win32 is a part of the OS and win32 is the canonical published syscall interface. Win32 and the GUI utilities, are literally the part of the OS, as much as the syscall interface is to the linux kernel and cat/grep are to the shell, respectively.
The DE is a well defined thing, and this is not it.