Is that the reason GDP is silly though? Under the assumption that the car will attempt to go as fast as capable (not usually true for cars, plausibly true for a

Is that the reason GDP is silly though? Under the assumption that the car will attempt to go as fast as capable (not usually true for cars, plausibly true for an economy) and that the capability is a measure of quality (true for both), GDP serves as a nice proxy for something we do care about.