Contrast this with, for example, physical professions like professional basketball, where the faster ability to grow in fitness and strength, along with certain racial advantages with height or speed means the population tends to skew in one direction - enough so that creating separate leagues allows for fairer representation.
Software development is not like that. The very fact that the majority of programmers used to be women back when it started should be enough to show that current bias' are societal or fashion-based.