Ahhh quick builds. I only participated in one, my own KH rehab. It was fun for me, even beer in the parking lot in the evening.
It was quite a status symbol and feather in the cap of those on teams of "specialty" workers. Brag brag brag. I know they felt they were part of something glorious and had their own camaraderie. Some learned trades, and it was a brilliant idea from a high control group. Everybody got something out of it.
But it really was scam. I've heard so many stories from professional contractors, brothers, that would try to guide the overseers and advise them of problems or things that they were doing wrong. Those project overseers would take shortcuts,ignore the advice of the professionals and not do things according to code resulting many redoes. The society always did things back then with the idea the system was ending soon and nothing really mattered in the long run.
Sometimes things sound good on paper.