There are the standard modern terms cut, paste and copy.
In regard to windows, buffers and frames, we could have a mode of
operation which ties each buffer to a one-window frame. That would
eliminate a lot of complexity.
We could even offer that as the mode of use for beginners, if that
would make it easier for a new generation of hackers to become Emacs
users. I don't know whether it WOULD have that effect, but if it
would, I think it is a good idea.
Do beginners typically run Emacs under a graphical window system?