So. Let me see if I understand:
Some people think it matters to all womankind what titles we use, because those titles define us by our marital status. This is seen as something we still need to fight because of historical inequality with men that is still ongoing.
Other people think we have moved beyond it mattering (maybe because of all the good work done by feminists gone before us?) and therefore each woman can choose for herself. Individual choice with no wider implications.
I am really torn. I think I lean to the former. I am a Mrs by the way with no real intentions of changing...
Two thoughts:
In Canada, they use Ms. almost all the time and sometimes Mrs. (although I left Canada in the mid 1990's so this might have changed). No grown woman is ever Miss. It really took some getting used to when I moved here. Miss for me still has little girl connotations.
Also, I have a job where I have to perform a lot of CRB checks on people. The system we use will not allow you to put in Ms. and then only list one surname (e.g. Have you ever used any other surname - you cannot select 'no'). So in effect they are saying that Ms. is only for divorced women. I find that outrageous!