>>1275901The bike industry used to think that, but as they gathered more data they realized that they were wrong. It is true that women have narrower shoulders, so women's bikes get specced with narrower handlebars. Women also tend to prefer less aggressive geometry, which is why the Ruby is more laid back than the Roubaix, for instance. Cycling Weekly has a good article about it here:
https://www.cyclingweekly.com/fitness/bike-fit/custom-bikes-womens-specific-geometry-381525