The "existing capability" label is the reason for closing
It's not an existing capability, although "workaround available" would be fitting.
please don't hijack issues for different purposes (don't ask to close empty files).
I'm not, it's what the OP said above:
if a new file is opened, stuff gets dropped into it and then ctrl-X'd out of it, closing should not prompt for save.
Anyhow closing and saving empty files is a perfectly reasonable thing to do.
I'd wager it's far less common than using a temp/untitled file as a scratch buffer (at least for me it's _way_ more common).
The newly proposed change would remove that possibility.
For the unusual case where someone just wants to create a blank file in a text editor they have no intention of editing, they can just use the Save As button/menu/keybinding, easy peasy.