In truth there is no "average person" or foot. Each has its idiosyncrasies.
And that's where the problem lies becauseshoe manufactures are determined to fit that illusory "average" foot. Bespoke makers see all the people that cannot be fit by average shoes and/or who have feet that cannot tolerate an improper fit at any age. Wide forefeet/narrow heels, long toes/short toes, high insteps/low insteps--stock in Trade.