> Many Wikipedia articles have coordinates, so I thought they could become cards

For an alternative use: the OSM app CoMaps fetches those articles and also includes them in the offline maps.

Last time I was walking around a tourist city, I didn't even bring a tourist guide book. I just followed OSM to the sights, and read the Wikipedia entry about the things I saw. All without using my phones roaming data plan, or even leaving the maps app.