> None of that stopped women from entering law, medicine, business, etc.

As to law, it didn't happen by magic. After openly excluding women into the 1970s, law schools and law firms made concerted efforts to increase the representation of women. Large law firms not only track demographic information for hiring and promotions, they disclose it to legal publications who report on it. These days much of it has become self reinforcing. Frat culture has a hard time surviving in an environment where a big chunk of the clients are women (a quarter of existing Fortune 500 CLOs and a third of new ones are women).

That's all true of tech as well. People should seriously ask why women aren't choosing tech careers, because the "old boys club" or "frat culture" explanation isn't at all unique to tech.