If a handbrake failed to stop the car, we would put the blame squarely on the car manufacturer and we would require strict standards and regulations for car handbrakes.

i get it’s outside your metaphor, but if it was a recurrent and spontaneous problem, yeah i’d blame the manufacturer. it could also be a maintenance issue (failing to replace rotors/pads is the first thing that comes to mind. fuck, i gotta get new brake pads for my bike)