Here's my theory about modern architectural design. Let's say you've got two students that have to do a final design: (a) chooses a rococo or neoVictorian (humanist design); and, (b) chooses a spare modern design. Both of them are required to draft facades, elevations, etc. The modern design is literally easier to draft — literally less time. That means any school of architecture that both rewards "good grades" and "project completion under pressure" will naturally select for students who like "modern" (brutalist?). Those students then become professors, and the whole system reinforces.