One issue I have with Trello is that it has multiple types of items. And that it is not recursive.

When I create an item "Supermarket" and then an item "Bread", I cannot drag and drop the item "Bread" into "Supermarket". But that is how I think. I have a lot of "items" and each item can contain other "items". I don't want any other type of object.

Another problem is that I cannot customize the layout. I can't remove every icon from the items in the list. I only want to see the item names, no other info like the icon that shows that there is a description or anything. But Trello seems to not support that.