All I'm asking is SOME way to bring back old items from past mission passes. It could be from fresh finds, or a revival, or anything, just give me some way to know I'll be able to complete my CAST's look at some point in the future. (There is a very specific female CAST head I'm after which is completely unique in its design- there AREN'T any similar alternatives, period. Not even on the JP version. I checked.)
Even just knowing there will be a way to get that, and other past items in the future would be enough for me.
You brought up treasure shop- do past mission pass items even appear in there? As far as I'm aware, they don't....
EDIT: I just thought of an excellent way to bring the old items back. Why not add them to the mission badge exchange? That way they won't get in the way of new mission passes, but you won't be completely out of luck if you miss out on a particular tier, either. It would even help people that did complete past mission passes, as they would now have a means to get a 2nd ticket to unlock their favorite pass items account wide.