Any "standard" that pretends men and women share the same relative tissue density is idiotic on its face.
By failing to account for gender, the gov't BMI "standard" resigns itself to junk science status.
Given normal body fat percentages, a man 6ft/180lb is unlikely to be considered overweight, by any definition. A women, 6ft and 180lb, biologically has a much larger fat proportion, and would likely be considered overweight. Both share an identical BMI.
Who could possibly think that makes any sort of sense?
Men and women don't share the same tissue density, but women can handle extra fat a lot better than men can.