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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: On removing some obsolete code from subr and core
Date: Sat, 05 Nov 2016 19:59:51 +0200
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> From: Mark Oteiza <mvoteiza@udel.edu>
> Date: Sat, 5 Nov 2016 09:50:05 -0400
> Cc: Emacs-devel <emacs-devel@gnu.org>
> 
> > Why do we need to remove buffer_defaults? Once it is not exposed to
> > Lisp as variables, what's the harm?
> 
> None aside from (presumably) dead code.

It's not dead code at all.  It's how Emacs knows the default value of
every variable that can become buffer-local, and that's how it can
initialize every new buffer with those default values.  I don't see
how we could remove that.