On Mon, Nov 28, 2022 at 5:48 PM Eli Zaretskii <eliz@gnu.org> wrote:

I still don't understand why would that constitute a bug.  It is created so
> that future compilation wouldn't have to worry about its existence if and
> when they need to deposit *.eln files there.
>

Because preventively creating subdirs that will, or will not, ever be used
is untidy.

Also, because if someone has taken the effort of setting the variable, it's
quite possible they don't want .eln files in ~/.emacs.d/

Yes, they should use an absolute path, and/or `startup-redirect-eln-cache'
(preferably).