User blog comment:FishTank/Infoboxes on Fandom/@comment-33359237-20200314120255/@comment-4522253-20200315154016

Great question!

Cards are not discouraged, and we may talk about them in more depth coming up. We use them as cards in many places, including the Fandom Staff page. In this post, I introduced the idea of cards so that folks would be more familiar with them if and when we referred to them later. Right now, cards in a group are somewhere between infoboxes and an image gallery, and we don't really have a consistent way to deliver them easily. When I make card sets, I tend to make the Portable Infobox type something unique like "card", remove the floating and clearing, and place them in a  that uses flex CSS.

That said, if you have a card set below, you should still have a traditional infobox in the lede that covers the concept of the page; otherwise the first card will appear in the primary infobox position on mobile.