Can we cause essentially a run on the bank by having 40% of us move all our liquid assets to euros at once and continuing to move incoming money to cash?
Apps that continue to run in the background are normally very slow starting apps that work around this by showing a system tray icon for the status of the app.
Most apps don't do this because Windows and Linux must also work on under specced hardware and don't have good out of memory behaviour
The some roundabout way is not at all roundabout when most apps have exactly one window and closing it quits it. Closing a multiple window app by closing it's only window is just a continuation of this expected behaviour.
you cannot use it via bash you configure it and it applies actions to windows as they are created you cannot use it at all where plasma isn't your desktop and as of wayland you cannot use a different window maanager with KDE plasma as wayland doesn't have the idea of window managers.
I don't think you are ever again going to have an agnostic way to do this
Nobody who can't afford insurance can afford 2400