Re: "whether the global keymap C-x 4 will be replaced by a command,"

[Richard Stallman]

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  > Would it be more expected for `C-x 4 C-h k C-f` to show the help buffer
  > about `C-f` (forward-char) in another window?

For consistency, C-h k C-x 4 C-f should show the help for C-x 4 C-f.
That is find-file-other-window.

C-x 4 C-f is an important command -- don't break it!

-- 
Dr Richard Stallman
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)