So we should expect 50% men in elementary schools? How about lumberjacks? Should those be 50% women too?
A non discriminatory hiring process should reflect the demographics of the workers in the given field (other factors like geography matter too). Why would we expect, say, pediatricians (80% female) to have 50% men?
Achieving a 50/50 split between men and women in a field that's 80% one gender requires hiring one gender at 4x the rate of the other. This line of thinking is what leads companies to set up discriminatory hiring practices in pursuit of DEI goals.
The even government office of non discrimination compliance agrees: https://www.dol.gov/agencies/ofccp/faqs/AAFAQs
> The purpose of affirmative action is to ensure equal employment opportunities for applicants and employees. It is based on the premise that, absent discrimination, over time a contractor’s workforce generally will reflect the demographics of the qualified available workforce in the relevant job market.