Re: facemenu-unlisted-faces

[Richard Stallman]

    Perhaps we are miscommunicating. AFAIK, faces are customizable, which means
    that they are designed to be customized.

No it doesn't mean that, any more than the existence of a "variable"
means its value is meant to be changed, or the existence of a function
name means that its function definition is meant to be changed.

Almost anything in Emacs can be changed.  But most Emacs facilities do
NOT try to be bulletproof against all changes that someone might make.
It would be counterproductive.  So please forget about arguing that "X
has to be bulletproof against changing Y merely because Y can be
changed."