I have a small script to toggle the visibility of a window when I press a hotkey. Press once, it launches the app if it's not running, or unhides and raises the window if it is. Press again, it hides the window.
My distro recently switched KDE to Plasma 6 on Wayland, and of course the script stopped working. Researched how to make a Wayland equivalent. You can't. It's literally impossible to hide (or even minimize) windows from the command line.