Whatever a building is designed to do, in real life it will have to do something else, and then something else again, ad infinitum. This use of scenarios remains conjectural at present, but we'd love to try it. Real estate is an astonishingly unexamined phenomenon. Books on the history of architecture outnumber books on the history of real estate 1,000 to 0, yet real estate has vastly more influence on the shape and fate of buildings than architectural theories of aesthetics. When you proceed deliberately, mistakes don't cascade, they instruct.
Evolutionary design is healthier than visionary design.