bug#583: Use XDG basedir spec for configuration files?

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Cc: 583@debbugs.gnu.org,  ferkiwi+a@gmail.com,  eggert@cs.ucla.edu
> Date: Wed, 28 Aug 2019 12:50:46 -0400
> 
> With a proper following of the XDG spec, the concept of (a single)
> "user-emacs-directory" would no longer be present.

I'm not sure I understand why.  Can you tell more?  (I know very
little about XDG.)