BMI is perhaps more useful based on the average person, as it was devised back in the mid 1800's. I like you are categorised as overweight on this scale, and I almost have a six pack, as I have bmi as below:
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My body fat according to my Withings scale is 11.6% (my Fitbit scale says 13.2%). In order to get into the "normal" category, I don't think it is possible for me to ever get into the "normal" range on BMI, as when I train harder with weights my weight goes up obviously and when I occasionally drop into the late 85 kg my body fat % goes up. Long winded way of saying I am in agreement with you that bmi doesn't work for all (I can't imagine loosing circa 6 kg) and that body fat % is a better representation, but bmi at least gets people thinking and can be worked out free.