Really, I kinda agree with you. The main reason of why Card Trooper is banned, however, is how highly splashable it is. Compare it to Lightsworns Ryko and Lyla. Both of these cards will FORCE you to mill, and in the case of Ryko, is only useable once. For Card Trooper, it can be used as many times as you'd like, and you can chose the number of cards you want to mill. I think it should somewhat stay on the limited list until Zombie decks become unpopular.

Now, a card I would like to see off the banned list, is Monster Reborn. There was no combo that abused it before it being banned. When it was limited, it was totally fine. Sure people found it annoying, but we find all of the Blackwings and Lightsworns annoying. In return we got Call of the Haunted for little reason. I don't know why that card was banned at all. Its not like someone unbanned Dark Magician of Chaos.