That's absolutely crazy how old it is. From my very anecdotal perspective, BMI is only used when addressing obesity or anorexia as a first-order approximation,

That's absolutely crazy how old it is. From my very anecdotal perspective, BMI is only used when addressing obesity or anorexia as a first-order approximation, or rather illustration and a way to find out where you are in relation to peers of the same sex/height/age. Do other formulæ fare better in those use cases?