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

[Drew Adams]

> Trying to type 'C-h k C-x 7 C-f' ends the keysequence after
> 'C-h k C-x 7' and displays the help for the other-window command.
> 
> This means that after binding the current ctl-x-4-map in Emacs core
> to the other-window command, 'C-h k C-x 4' will display the help for
> that command, not for the whole sequence 'C-h k C-x 4 C-f'.

That's unfortunate.  `C-x 4 C-f' is presumably still
a key binding (?).  It should be, at least.  And as
such `C-h k' should tell you directly what it's
bound to etc.  We already have `C-x 4 C-h' to show
us all of the `C-x 4' bindings.

Sounds, so far, like a step backward.  Why?