I wear a wedding ring. As does my DH. I didn't relinquish my own identity nor do I carry the title 'Mrs'. Mrs Heslop is my Ma, Mrs van Arkle, my MiL.
Assuming a default of all adult women to 'Mrs' isn't removing anyone's 'choice' (and how beloved is that word on this thread?) considering those people can easily correct the 'title' (if we must insist on having the silly things) to something they prefer.
In these circumstances I'd be asking them to change to 'Dr'. (Not that I'm necessarily 'proud' to hold a doctorate, but at least I did put in 3 years' solid work for it which makes more sense than pride in walking up an aisle and signing a piece of paper. But, hey). Presumably, a woman who prefers to be referred to as Ms (get you, you ole feminist boot) or Miss can request that change too.
Or is the 'real' reason people are upset at defaulting to 'Mrs' for all is that it somehow questions the value of walking up an aisle and signing a piece of paper? If I want to call myself Mrs it makes zero odds to me whether the rest of the female populous calls herself Mrs or not.
NB. I am not for one moment denigrating marriage. I'm happy (note happy, not proud) to be married. But I fail to compute why everything about who I am and how I live needs to somehow be viewed as an adjunct to my DH, especially when no similar expectations are placed on him.
Also - the question of titles isn't a free 'choice' when so many women out there quite clearly object to that 'choice' and are not actually choosing it in the first place.