The 'banned' tag has some value in that it informs other members that they should not expect responses from a member who has been banned. As bhai said, members are only banned for good reason. That good reason may not be apparent to you, but those members of staff who impose bans do not do so lightly.
It would be inappropriate for the administrators/moderators to explain publicly why a particular member has been banned. We know, and they know; that is enough.