Re: Moving the goals? @Tom38
BMI is, as Ledswinger says, only useful as a generalisation for large numbers, and "outliers" are possibly more common than those who fit the "average" mould.
I have broad shoulders, big hips, large rib cage. Someone can be the same height as me, and have a significantly higher level of fat but slimmer shoulders, rib cage & hips, and have a lower BMI. Muscle is denser than fat, so for 2 people with the same dimensions the more muscular one will have a higher BMI than the one with more body fat. There is so much variation in body types that a simple calculation based purely on height vs weight IS virtually useless.