bxl-forever
Quite so but OSM is not just a beautiful map but a database containing all kinds of vectors.  We use those for navigation, e.g. to show realistic pedestrian routing *across* the area instead of having just an area (which would advise you to walk by following its outline, which will look really weird).
StreetComplete is a very basic app and does not see the difference, hence some strange questions popping up in this app.  Don’t bother too much with that.
In the mean time I’ve filled the surface and lit tags here; it should stop complaining about those.