I find a lot of the old suffixes are under utilized by being left to sit in a player's /tags when they have no intention of using them. This can be easily rectified by allowing people to withdraw suffixes into tags and give them to other players who will actually use them. This will both bring new appreciation to old tags and allow new players the chance to get their favorite tag.
What about the unique tags that were part of events and such, that means that you wouldn't have to grind for something and you could just buy it off someone if you are rich enough, also you have a chance to get them from the TimeCapsule crate which would lose a lot of its purpose if it was added. In my opinion, tag system is great the way it is besides a few tags which would need a gradient .