Exactly. Depending on where you live it’s hard to impossible to get permission to go above the existing ridgeline of the house, leaving people to poke flat roof dormers out the side.

Flat roofs don’t have to leak. I’m doing an EPDM roof on my garden office at the moment. It’s a single huge sheet of rubber.

As others have pointed out, the lack of eaves is the real killer. My dad was over from NZ in the summer and he was saying that fashion is there too. It’s causing all sorts of water issues for buildings.