I disagree with you. It is not a matter of “political correctness” anymore than any other standard of etiquette. The tradition has generally become to refer to adult women as Ms unless she expresses a preference for Miss or Mrs..
It was never the intention of feminists to make Mrs. or Miss unacceptable. The purpose in introducing Ms was to offer a choice that did not indicate marital status.
I couldn’t help but laugh at the signs that greeted us over the doors at our brand new school twenty-five years ago. All the married teachers where “Mrs.” All of the unmarried teachers were “Ms.” That was the choice of the administration.
Yes, this is what I was expressing. Correcting a long-standing error is not political correctness. Ms. is in almost all everyday contexts the only proper equivalent of Mr. What Ms. Manners says [corrected link] is, like most of her advice, to be ignored.
It’s true that in government, Madame is the preferred variant and that is probably what will be used. Or Madam. Another argument for another day.