The reason for the marriage thing is simply this: not every woman (or man) wants to get married. The cultural and often sexist assumption is that it's all women want and strive for, and it simply isn't true.
But what does that have to do with Doctor Who. Its not been said in the show that anyone (with the exception of a comedic Benny Hill type scenario with Donna in The Runaway Bride) is only striving for marriage. And I think even Donna outgrew that because what she really wanted was something, anything, different and she stopped persuing marriage when she saw the adventures she could have in a platonic way with the Doctor. Lets not forget, that regardless of whether the Doctor wanted to, she laid the ground rules and said from the off that there would be no funny business.
I kind of see the angle you are coming from with your points, but it seems to me this has sort of become your own agenda and doesnt really have anything to do with the show. You have provided a link to an article showing Moffats views as a person, but nothing to say that he, or any other writer for that matter, has imprinted those feelings onto the show. In the last 5 years we have had Rose, who admittedly fell in love, but never once uttered the M word. We had Martha who instead of striving for marriage decided to remove herself from the situation completely and later married someone completely different off screen. Donna who gave up on the idea of marriage in favour of friendship and Amy who got married, but only after she had delayed it by running to the end of the universe and even then she only gave into it when her fiance died in her arms and she realised what she could lose if things hadnt been rewritten.
Nobody is saying that every woman (or man) is striving for marriage, but you seem to think, or at least that is how it comes across, that anyone who gets married or wants to get married is showing a weakness or is a product of sexist pressures and agendas, and that simply isnt the case. People in Doctor Who have gotten married, but NEVER has it been stated that as characters that is all they strive for, and through watching exactly the same show as everyone else in this thread, I would say it hasn't been implied either
