Sander
To be honest for me it is more of a cleanliness and design issue, its not pleasing to the eye, which the rest of the app is.
And it is maybe handy because you get your first 3 passes for free so that way you can have a overview but the idea of moving them to an archive sounds good. I was told by the helpdesk of bunq that the cards will be removed after a year or so, i wouldnt know if thats true cause I have those passes less than a year now.