In my mental model (which is also how OSs work, though not necessarily how things ought work), the clipboard exists at the OS level, and undo/redo act on the application level. I don't find it to be unexpected or undesirable that doing Ctrl+X,V,Z,Z results in the application returning to its original state but the clipboard ending up being modified.

All that said, I appreciate that this interrogated my mental model a bit.

The Emacs mark-and-point UI works for everyone: fully functional hands, partially functioning hands, or even speech recognition. It also solves the problem of copy, cut, and paste described in the article.

imagine having that guy as your roommate!

This is why copy and paste is broken for so many years, because devs at these beautiful companies, decided to let you wipe your end-user's clipboard when chatInputText.length === 0 or whatever. I noticed people having consistent issues with copy and paste when Teams became more prevalent, and it made no sense, until I realized.

If you work for one of these chat companies, for the love of GOD make an internal ticket, this is embarrassing.