Not sure what you mean by "It is not useful for that purpose" what do you mean
by "It" and "that" in this context.
With regard to complaints there are reports about this that have been active
nearly all the time since this was broken by 2.2.0:
https://wald.intevation.org/forum/message.php?msg_id=2569&group_id=11
This thread triggered your initial opening of this issue.
I agree that wildcard / multifile it is not very important. But I think we
should fix it as it is a small annoyance and it worked with gpg 2.1.0. That it
stopped working was due to our switch to mingw-w64 and not due to a decision
made by us to disable this. So I would see this as a Bug.
Some more threads about this:
https://wald.intevation.org/forum/forum.php?thread_id=1119&forum_id=21&group_id=11
https://wald.intevation.org/forum/message.php?msg_id=3404
P.S.
Yes I dislike the message boards too but they are surprisingly active.