I am still of the opinion that the GB and majority of Bethel muckety mucks totally believe their own BS.
They build to accomodate their current needs and probably for future District Conventions.
I really believe the building style and shape is about doing things as cheaply as possible while still having a nice presentable facility.
The WTS has known for a long long time that their construction projects are a key way that witnesses build strong relationships with each other. Working long hours, stressed and trying to make the deadline for their crew, eating communal meals and quite a few suffer money issues at home in order to participate. Since the United States and other countries haven't persecuted Witnesses for decades the community feeling they get as they work together and consider themselves martyrs at the same time can forge a strong lasting bond. The friendships from these construction projects are much stronger and wider than those from doing d2d work and fill the need for social gatherings as well since those dont' occur nearly as often as they used to.
imho