I always viewed this more like: Men only get one title because nobody gives a fuck about men. Single, married, whatever. It's irrelevant. "Here, have a nice, generic title that means literally nothing other than you are male. Now get back to work so you can create some value for your rich land owner society!"

Unmarried women, however, have inherent (societal) value beyond their ability to work. That's why they get extra titles. It's the same reason why most societies don't use women in war.

Once you have that Mrs in front of your name, you're considered to have "succeeded." According to the old traditions, anyway. A married woman was viewed as having been put to work (by society). That was her primary job, and people cared a lot about it!

Of course, women were still expected to also do actual work but the sexist nature of these traditions meant that it didn't count for much. Mostly because "muscle" (ability to perform manual labor for a full 12-or-more hour work day) was what ran the economy. Serfs in the fields!

It may be archaic, but a young boy can be addressed as Master. When we were annual members of the San Diego Zoo, my son got mail from them addressed to Master [his name]. Also, Miss is definitely archaic. I haven't heard a grown woman referred to as Miss [her name] since the 1970s.

Mister is literally in my name. I prefer it.

Ms is for anyone, not just widows.

But Mx is better than any gendered title anyway

Dr.

Yeah, that's why very few modern women go by anything other than Ms. I'm actually quite old fashioned preferring Mrs. and I only do to honor the long fight for my right to marry.

Japanese nails it with their -san and -senpai and -sama. The only part they care about is whether someone is your senior or not, no matter their married status