It appears that Warner Losh <imp(a)bsdimp.com> said:
Most of the emacs GUI adaptations assume that it's
THE instance of the
editor. With multiple terminals, I can have multiple editors with
different contexts. With the GUI, it all gets dumped together.
Some of us use Epsilon, a proprietary version of Emacs that
is now over 40 years old and still actively supported. It works
great on several versions of linux, MacOS, and FreeBSD. You
can run it in a terminal window but it's nicer as an X client,
and if you want to run several copies with different verions
that works as you'd hope.
It costs money and is worth it. My main kvetch at this point
is that they only have x86 versions, no ARM yet, but on my
Mac it runs fine under Rosetta.
R's,
John