My muscle memory automatically uses Emacs keybindings for this, in editors like Pluma.. and the whole buffer is gone. Fortunately there's an "undo" option. But I really want Emacs keybindings to work everywhere. I have my various shells set that way.

> every native app

That's a very big fineprint. With three most popular apps among developers being (I imagine) browser, jetbrains ides and vs code derivatives, all being non-native, muscle memory becomes pretty unreliable.

But yeah, would be big, if it indeed was universally supported