I wish there was some way we could delete old TC messages. Last season I had a list of probably 10-15 people I had a discussion with at some point. Most were just a few back-and-forths that resulted in nothing, while a couple were extended trade discussions on more than one occasion that ended in one trade, if not more. Owners who were essentially on my "GM speed dial" so to speak.
If we want to start a new TC with someone, we can just create a new TC. I see no reason why old TCs should have to stay there when we know the discussion is over. Meanwhile, if we can't delete old TCs, we should at least be able to "star" TCs that consist of owners who we talk with frequently and who are easy to work out trades with.