yichusdik: I think hypothetically, you make a good point. But practically speaking, I think it can open up a path better left closed. Once you open a new position of Jewish leadership, there will be those that will push/push themselves into more areas of Jewish life.
You have the “Rabbonis” that you’re bringing your bedikos and your chickens too. Soon you’re asking her your hilchos Shabbos. Five years later, your neighbor is bringing his esrog.
When its an official title, you have an opening to broaden the responsibilities in dangerous ways. When you are going to the “Rov’s Rebbitzen” and her authority is only an extension of her husband’s, then I feel this possibility is prevented.
The question is, why be poretz geder? Like you say, many of these roles have been and are already unofficially filled by women. What is wrong with the way of our fathers (and mothers)?