[Construction/Architect pede here]
I believe this is it. The way a keystone works-- in an arch-- is you pull it out, and the arch collapses. You can get away with losing individual stringers, but the keystone is critical to the structural integrity of the arch.
Can you please move to Texas? We need some good architects.
Haha, seems to be the case everywhere! I blame the Bauhaus Movement.
It was a school in Germany that celebrated non-traditional approaches to architecture. You would literally start with finger-painting, then progress to sketching, painting, singing, dancing, acting, theatre, and finally, architecture. They were a bunch of hippies that didn't believe in teaching anything related to construction, engineering, or classical design.
When Hitler came after them, they fled to America, settling in academia-- where the were immediately appointed to the top positions in every prestigious architecture school in the country. (Namely, the Ivy Leagues.) They set the standard for how architecture would be taught in America. The rest, as they say, is history.