It's a part of a general push by tech development hipsters to "integrate" experience in order to boost immersion. By this they mean "we think you should all have smartphones or tablets constantly by your side and we will make a second screen experience for you to play using them" So we got an app which allows us to manage our inventory in a way that would be a chore if we didn't use the app, as well as detailed story being fed to us on a second screen. They expect you to see that "card acquired" bar pop up and to be able to immediately flick to grimoire in the app (which is already open for inventory management, [i]obviously[/i]) and read the card. Same with BF4 and their commander app. Same with Fallout 4 and their Pip Boy app (and smartphone cradle wrist band). Same with XBox Smartglass I don't know of any other examples of this off the top of my head, but be assured that this is something that more and more developers are going to be working on.