Since the card view seems to fit mobile device screens pretty well, it seem a perfect place to be able to represent a item as a card. However, on the mobile device you cannot add a new item. My suggestion is to add the ability to add a new item for card view on mobile app. For us, this is the perfect place and a clean way for time tracking as an example. Same goes for the Kanban view, which is also nicely viewable on a mobile device. My two cents. Thank you.
still cannot add new item in kanban view in mobile IOS is a big drawback