Ah, now, I know a bit about this! I did a bit of digging a while back, since I too was outraged that a woman’s title was dependent on her marital status, and I found out some interesting and surprising stuff.
Apparently, once, the words Master and Mistress were used to address people of status but without a formal title (eg, Lord, Countess, etc.) and used to differentiate such noble, untitled people from the servants. They were also titles applied to people of skill in a particular area, eg a craftsman or a teacher. In order to shorten the written words, Master became Mr and Mistress became Mrs or occasionally Miss. The two titles were used interchangeably and it did not denote marital status. Women of status or skill who were not married still referred to themselves as Mrs, Mrs Jones the housekeeper. Younger women of the gentility but without their own titles started referring to themselves as Miss in order to ensure their status was known but to differentiate themselves from the housekeeper, the cook etc. Around this time, married older women in a household began referring to themselves as Mrs (husband’s first name) Bloggs, in order to confer status as senior untitled woman in a household. Jane Austen and other writers of the same era took this up with a frenzy and it became a modern thing.
So all stems from a class issue, rather than a sex issue, but somehow time and society have turned it into a marital issue.
I’m happy to be Mrs BiTB (and use my maiden name) and have been since my very early 20s. It causes some confusion that I use Mrs and my maiden name, but I can call myself what I want really. It does irritate me that such emphasis is placed on a woman’s marital status that isn’t placed on men, but I don’t think that going down the path of trying to create a whole bunch of new titles that don’t reveal your marital status really helps - it still categorises women probably in a way we don’t want to be categorised. No idea how we solve this, but basically I try to avoid using a title at all, except when I am at work and use my rank (which is the same for men and women in my role.)