What harm does it do? No one is forced to use Miss Mrs or Ms, it is their choice, a single woman can use Mrs is she wants to a married woman can use Miss they all can use Ms.
This has been answered upthread. There isn’t a truly neutral title, as I explained in a previous post. Even ‘Ms’ is saying that you are choosing not to use the other titles, that you actively don’t choose to share your marital status, and it comes with baggage - see some of the assumptions and comments upthread.
We can’t choose not to use a title. We are forced to use one, and none are truly neutral.
But after that we come back to - what’s the benefit to all? The answer is that there isn’t really one, or men would be clamouring for titles to show their marital status.