Thank you for your feedback.
The issue I exposed first, is not related to the admin, though. It’s related to the users who are not admins.
When I set a tag group that contains tags that can be seen (but not used) by people who are not admin such as this:
the users who are not admins, should still be able to create topics or reply to the topic, even if the topic requires at least 1 tag. In this case I’m using “admin” as the restriction, but it could be anything else, another group of users that can use the tag. So when I create a requirement for tags that are limited to a group of people, but then another group of people are required to use those tags they can’t use, it doesn’t make much sense.
It’s like saying: only people from Italy can enter this door, but we don’t allow anyone, regardless of country, to show their passport to confirm where they come from.
Hope it makes sense?