“The body mass index has long been criticized as a flawed indicator of health. A replacement has been gaining support: the body roundness index.” Article unfortunately doesn’t give the freaking formula for chrissakes; it’s “364.2 − 365.5 × √(1 − [waist circumference in centimeters / 2π]2 / [0.5 × height in centimeters]2), according to the formula developed by Thomas et al.10”
That’s because BMI is actually pretty good as a screening tool. It’s easy, simple, and pretty damn accurate when combined with an eyeball test. To the extent that it misclassifies people it is far more likely to underclassify obesity than overclassify. The people complaining just don’t want to hear it.