BMI is used because it works in the vast majority of cases. It has never worked for someone like you and was not intended to. Just keep that in mind.
Oh, I am well aware. But it would not be difficult to implement a a better measurement standard. Hell, even something as dumbed down simple as Waist to Hip ratio is a better gross predictor of health. Belly Fat does not lie.
I get where you are coming from. People are too stupid to even understand BMI. Changing things will complicate the dumb even more.
It's pretty fucking obvious if you are fat/overweight. There are just a bunch of morons that think they need something to prove they are/aren't (that they then argue against saying its inaccurate because it does not work for a small portion of the population).
Thus, why this is in /s/fatpeoplehate. ;)