Good catch! I must have mistyped in StreetComplete. I will correct it now.

If my basic outlines interfere with plans to detail porches and meter-long bevels, then delete all you’d like.

I compared the building outlines one by one against aerial imagery. I manually adjusted nodes whenever the fit was poor. I usually omit anything that looks the least bit tricky, but this neighborhood has straightforward detached houses unobscured by trees.