Architects, of course. Everyone who looks at buildings knows it. They don't know how to put in bathrooms in numbers appropriate to the expected occupancy of the building, they don't know how to design buildings that look halfway as good as those built before the first world war, and as noted, they subscribe to the ultimately silly dictum "form follows function."
Occasionally, you have to wonder why they get jobs. The answer is that despite their incompetance, no one else has arisen to take their place. Pitiful, in a way, quite sad.