And I took a look - quite some buildings in this neighbourhood which were created before already have meh positioning, like:
ways: 570516341, 384944456, 570516467.. A lot of buildings are missing completely.

There is a neighbourhood with addresses which you created 2 years ago btw, but there there are no buildings at all - https://www.openstreetmap.org/node/8145744579. 

All I'm saying that it's not a perfectly mapped place, mildly saying hah, and it's a bit strange to say that adding small buildings with AI (even if some of them may have somewhat not exactly correct position) is "not useful" when there were no buildings there at all before, which is like 100% useless, as there is no info at all.