Emacs key bindings through the ages

[bramble]

The default GNU Emacs key bindings seem to work very well. They seem
particularly well-thought-out, in fact. Like stones in a stream, worn
by movement and time to have very few rough edges... They mesh well
with the ascii control characters, and I particularly like how M-<foo>
is often used as a sort of "turbo boost" to C-<foo> (like C-f vs. M-f,
for example). In cases where it makes no sense to boost the C-key,
Emacs often has elegant mnemonic bindings, for example, M-u, M-l, M-c.

Were the bindings designed as such right from the beginning by only
RMS? Or have they morphed over the years, with user and developer
requests guiding changes? Can anyone shed any light on the history of
the default key binding choices?

(Please note, I don't wish to start another thread comparing Emacs key
combinations with CUA bindings. I realize that, for whatever reasons,
some people just don't like or can't get used to Emacs key combos, but
I was hoping this thread would simply address the development and
history of Emacs bindings over time.)

Thanks.