I'm trying to pitch a flat section of roof on my house because it leaks. Flat roofs are sometimes flat because of too-low or badly-defined building height limits.

Boringness also probably comes from increasing numbers of people involved in approvals. Try getting some wild thing through public hearings and city councils. Much harder than a cube. The boringness is a feature, not a bug.

I bet there's a ton of other factors too, like the cited attention cost of detail.