It's a really good question...
I started on an HP700, it created the .emacs file and I was always confused
about what I had written myself and what emacs was doing. Then I started on
an Sun Workstation and there they had installed XEmacs. It was there where
i stumbled across the .emacs.d/custom.el file and I found the idea cool. I
investigated a bit and adopted loading the custom file. <mea culpa>I never
investigated how customisation where added to .emacs </mea culpa>
I don't know how common my way of working is but I try out things using
Custom and then, if I adopt them, they become a part of my permanent
config.
Maybe Custom wlll need to check and eventually remove customisations from
.emacs if custom-file is defined... would that be feasible? IT isn't
something you do 10 times a second, right?

Best, /PA

On Tue, 4 Jan 2022 at 16:17, Stefan Kangas <stefankangas@gmail.com> wrote:

> Eli Zaretskii <eliz@gnu.org> writes:
>
> > What would that mean for users that currently save their
> > customizations through Custom in .emacs?  Would it mean that the next
> > time they save customizations, they will be written to another file
> > and removed from .emacs?
>
> Good question.
>
> I imagine that we would just leave things in place for such users.  It
> would be slightly jarring to have things moved around behind the users
> back.
>
> But maybe it would be a good idea to provide a migration command to
> conveniently move things.
>
> Or we could prompt the user about moving it.  To avoid being annoying,
> we could record the answer, and not prompt again if the question was
> already asked.
>


-- 
Fragen sind nicht da um beantwortet zu werden,
Fragen sind da um gestellt zu werden
Georg Kreisler