tl;dr - It's driven by internal room shape requirements (plus weak planning; in some jurisdictions "no, that's an eyesore mess, redesign it" it a thing in planning, but I gather largely not in most US juristicitions).
tl;dr - It's driven by internal room shape requirements (plus weak planning; in some jurisdictions "no, that's an eyesore mess, redesign it" it a thing in planning, but I gather largely not in most US juristicitions).