However, last but not least, I have this question for advocates of an effort to pass an ERA. What is it that it would achieve that is not already being achieved via existing civil rights legislation?
It would create an explicit line in the Constitution to challenge the Draft on the grounds that it is sexist.
Most supporters of the ERA would probably not want a draft for either gender, so I don't think that is their goal.
In plenty of cases (esp. jobs), it is easier to discriminate against a white woman than a black man (or woman).
Doubtful we'd see any draft cases until we had an actual draft, and if single gender registration for the draft was held unconstitutional, we'd likely just see both sexes required to register. As for job discrimination, the existing provisions to fight it wouldn't be affected in the least. They are based on the use of the Commerce Clause rather than the Reconstruction Amendments.