Married Women

I have been using an alternative description that I like better than Mrs X. I have been using "Unknown, wife of ____" in the first name tab.
I agree that the use of the maiden name is very important, when that individual is not known by a specific name (Eleanore of Aquitaine for example), and actually has a maiden name (not true in early history).

I have seen on Geni an entry for the wives of Henry viii. they are all given the surname Tudor - Now that is confusing.

No one was born Mrs. Mary Husbandlastname. Even if married name is known, I use Mary Unknown to indicate that she was not born Mary Husbandlastname.

I do agree with that!

I agree with "use Mary Unknown", if you know her first name.

I like that

Mary Rundlett (Shatswell) or Mary Dale / Smith / Rundlett (Shatswell)

I prefer using her last married name with her maiden name: Mary Rundlett (Shatswell).

Mary Rundlett (Shatswell) or Mary Dale / Smith / Rundlett (Shatswell)
???
You see that is the problem

Just use "Mary Shatswell"

"Mary Shatswell" is okay, but may not have enough definition. I still prefer using her last married name with her maiden name: Mary Rundlett (Shatswell).

And that is why we have a problem.

When you look someone up you look for their birth name. You look for Mary Shatswell, born xx/xx/xxxx. You look to see when, where and to whom she was born, then for marriage, etc. Even if you start with who she was married to, in order to find the rest of the family you need her maiden name.
If you look up Mary Rundlett, you may well come up with several because Mary is such a common name but they'd be from the other side of the family, so to speak. True, there's probably more than one Mary Shatswell but not in one individual family (parent/child group) usually.
If a woman's maiden name is not known it make sense to put her married name, possibly with a note - Mary Rundlett (X) to the effect that maiden name is unknown.