Well that's just a fraction of what I was talking about. StumpWM is nice, but it's the window manager. But imagine an environment where, say in the web browse

Well that's just a fraction of what I was talking about. StumpWM is nice, but it's the window manager. But imagine an environment where, say in the web browser you could hit C-h k, find what function is bound to the key that bookmarks the current tab, and advice that function to make a backup of the bookmarks database. And that such mechanism being built in to the OS' application programming libraries, so that writing a GUI app becomes essentially reminiscent of writing an Emacs major mode. Imagine all apps on your desktop had hooks where you could attach code to be run on certain events.