Sorry, I thought I would receive an email when this was updated.

We don't do this on-the-fly to avoid cluttering the /run/user with directories.

So, I was expecting gnupg to use /run/user/$UID/gnupg/. However, if GNUPGHOME is
set, it uses /run/user/$UID/gnupg/d.$GNUPGHOME_HASH/. Therefore, by "littering",
I assume you mean littering /run/user/$UID/gnupg/ (otherwise this argument makes
no sense).

I'm leaving this here for future readers as I can't find *any* documentation of
this behavior (the use of d.$GNUPGHOME_HASH).

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Regardless, my actual goal is to move the homedir to ~/.local/share/gnupg (not
have multiple homedirs) as described in (T1456)
so I really do want sockets to go in /run/user/$UID/gnupg/. However, I'm
guessing that's not going to be possible.