I would like to see at least three things that I can think of
When opening a pack if you list a card on marketplace it doesn't give you what the current going price is. If you want to make sure you aren't cheated or are listing way over price you have to find it in your inventory then list. It just takes extra time.
I would like an attribute search for players I own in diamond dynasty. If I need steals by third basemen I want to see who would be a good option to use. You have an overall search like this but if I don't have everyone unlocked it's not useful.
I would like to list multiple items on the market at once. When doing the Team Affinity in 2020 I wanted to buy several players to exchange. It took FOREVER to submit buy offers