It is so employers can have stats to ensure diversity in their employees.
This whole agenda towards absolute equality in all aspects of life is ridiculous. Why settle for race and gender? Let's make sure we have equal amounts of people by eye and hair color, height, weight, or any other criteria. Doing anything less is surely discriminatory.
[1] as defined by the prevailing political zeitgeist
So rest assured, companies won't treat chin diameter the same way they treat race and gender in an imagined "agenda towards absolute equality in all aspects of life".