Flat roofs work if the architects have designed/engineered for very minimal angled roof lines -- actually expensive to do them right -- so I was told by couple of the country's A-Team architects. I've lived through it with our general contractor -- but my preference over those old, pathetic, looking, halls, etc.
The cult probably throws them up the commercial, inexpensive, way and plans to flip soon -- they can have the poor sheep redoing the roof issues yearly so no big deal.