BMI is highly useful. That it doesn't work for Dwayne Johnson is merely an attempt to reject the whole of it because known edge cases don't work. We know where it doesn't work: extreme heights and serious athletes who are enough standard deviations of muscle mass outside the norm. For that, we can do body fat %. But body fat% is harder to measure, so we've got a quick yardstick: It is BMI.

BMI is rejected because it tells people they're obese and since its unhealthy, they need to change themselves. Noone likes hearing that. The truth hurts.

You'll see these common rejections: 1. Bodyfat loss is hard, so its claimed as not a good measure. 2. BMI has outliers so _mine_ being bad doesn't count. 3. Because not being obese does not provide data about health, they attempt to deny obesity as a poor health marker. This is almost always "you can't tell a skinny person is unhealthy" retort as an excuse to reject obesity as unhealthy.

They will not escape the evidence-based scientific truth that obesity is unhealthy.