I fail to see your point. The law is not mandating equal pay, just transparency on the average salary for people doing the same work (which is trivial to establish in any large corporations where job descriptions are somewhat standardised). Obviously it’s not going to change much in a company where only two people do the same job but that’s not the work environment of most employees.

Many school don’t give out ranks on individual students, because this hurts feelings.

When the salary is public, most company will do equal pay to avoid hurting people feelings

I wonder how it works for positions of fame.

Actors/actresses get paid based on public demand.

Same thing with sports. Women's teams don't drive the eye balls or ad revenue, typically. Are they to be paid the same as male counterparts if part of the same org?

They aren't employed.