That’s not how language works, that’s how culture works. Mrs and mr are referred to you, not relatively to your spouse. I am Mr John Smith, even if I’m married to Mrs Amy White. Amy is not Mrs Smith and John is not Mrs White. They are Mr Smith and Mrs White. In the usa for some reason it’s custom that the woman changes surname to that of his husband, in many other places it was like that in the past but ia not anymore
I think voyager did it a little better with The Doctor, at least there was a reason why he was in the crew and was accepted as a person, but legally he was not