Times have changed, look at photo's of the Pro's, circa Anquetil and prior era and look at post Mercx ( never remember how to spell it ) modern era. Today the bikes of the Pro's are set up for efficiency and energy transfer, contrarily to the old days where it really was a crapshoot.
Unfortunately many people today still fit themselves to a bike that is uncomfortable, fixes you in anything but an optimal position and are therefor dangerous to ride.
Even a bike with straight bars ( not an MTB ) is designed with a relaxed yet performances oriented angled and sized frame. With the help of Cad and biomechanics, bike designers have been able to dial in design to fit a wide ranging body type, be it male or female.