I just have to put my 2 cents in on this. Back in the day I was on about 60 builds and remodels going back to before there were RBC's. Originally the RBC's were pretty loosely organized, as time went on they tuned up and I felt we did a lot of good work, including a lot of remodels inside and outside my RBC's territory traveling over 100 miles sometimes 1 or 2 times a month to NYC because NYC didn't have a lot of tradesmen brothers. The very last job I was on was the corporation's flagship Newburgh Assembly Hall.
Something happened, at least in this area. The RBC's took on a life of their own, becoming a good old boy's club and let's see how much we can rip these congregation off for. Brothers who were contractors and ran RBC's were stealing from congregations. No other way I can say it. RBC's charging more than top dollar for supplies/materials. Charging trip fee's to bring their contracting tool trailers on site and rent while they were parked there. Over buying supplies/materials and keeping the extras. Buildings that should have cost $500,000 would cost a $1,000,000. When my own hall was remodeled (I was no longer in RBC) in the preliminary talk by the RBC to the congregation the head of the RBC pretty much told us he was in charge and not to be questioned.
So, while I agree with the comments here that the corporation wanted absolute control over the builds I have to say it was a good thing to do when they shut down the RBC's, at least around here in the Hudson Valley