Thoughts already thought. It is an absolute desaster the current menu. And each time i attempt to write a post, i could say so much about it, but afterwards would feel so stupid for pointing out the obvious. My point simply is that the current menu is a pain to deal with considering the two major use-cases: chosing mercs and dealing with cards. It is such a pain, starting from the information display, up to navigation, and the seemingly little things like not allowing to trade up cards which your current merc has equipped. Considering last point: add a pop up menu, small warning, click yes or no, fall back to default.
I have not exactly the feeling like SD is currently working on anything major regarding the menu. It will simply stay like this for a while. By the way: the card info you made, this is what SD should integrate in their game, but just my two cents. It will be good, but most of the flaws in current menu will not go away by that. It needs to have someone at SD carefully reconsidering the choices they made about their menus: information display, navigation, use cases mercs and card management. Sometimes i wonder how much they are able to consider themself (beside all the work of course) to actually play and consider how it would be for them, if they would be casual players, investing a bit more time (more than lvl 10 currently, which i bet is average play time at SD in the game as casual … no argument of course, but at least try consider a casual player dealing with the menus).