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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: On obsoleting defcustoms
Date: Fri, 18 Sep 2020 16:28:59 +0300
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To: Stefan Kangas <stefan@marxist.se>
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 (message from Stefan Kangas on Fri, 18 Sep 2020 06:01:14 -0700)
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> From: Stefan Kangas <stefan@marxist.se>
> Date: Fri, 18 Sep 2020 06:01:14 -0700
> 
> Would it make sense to change ignored options such as this into defvars
> instead?

What problem would that solve?  Not all obsolete defcustoms have no
effect, do they?

> 2. Finding out that an option is obsolete
> 
> The obsolete options use a different face.  However, it's not obvious
> that this is the meaning of that face.

IMO, we shouldn't show obsolete options at all in a Custom buffer, for
the same reason why we remove them from the manuals.