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. ;)