The problem is that a core group of modernists kept doggedly insisting on it after it was proven to not work. For example, we know now that pedestrian skyways

The problem is that a core group of modernists kept doggedly insisting on it after it was proven to not work. For example, we know now that pedestrian skyways only work in limited contexts and have plenty of downsides; or that a large, concrete windswept plaza is pretty to look at but pretty antisocial and unusable space, and yet you still see this kind of thing in the latest from say Zaha Hadid et al. It’s why a next wave of architects and planners have coined terms like “bird-shit architecture” that only looks good completely devoid of context and landed from the sky.