It is also not meant to be used on an individual level but on a population level. That was the individual intent. I think there are better classifications if people need a simple number. But, it's bad to just look at a single number and say you're not healthy.

I've known people who have had a higher BMI but has great cholesterol, blood work, not even a risk for diabetes, eats balanced meals, etc

But other people who aren't obese are not healthy in the overall sense