I disagreed that they were sensible. Tags that are seemingly related to buildings were deleted from multipolygons and moved to an outer way, which goes against convention as I said. It makes sense to proactively undo changes from a new mapper, especially one that is quickly making changes to prominent objects across a large area until discussion can happen. That's why I was faster to revert.

In my model of the situation, the building and the stadium are logically equivalent entities so the tags should be on the same OSM entities. In other words, to me the outer way the encircles the stadium is meaningless without its relation to the building multipolygon. If there's a "stadium area", it would be the campus of the stadium that includes the nearby parking, the pitch, the stadium building, and perhaps the pedestrian grounds around it. It sounds like I'm in the minority here, and I don't have the energy to push back against esoteric OSM tagging schemes.