"... A novelist's 'individual technique', in Graham Greene's words, 'is more than anything else a means of evading the personally impossible, of disguising a deficiency'. Lesser writers never recognize their limitations. Many great ones stumble over something a hack might do with ease..."James isn't interested in courtship, but he needs to marry off his heroine not at the end of the book, but now, he "needs to cover that territory, and will do so without entirely meeting its difficulties".
"... Some of his best early stories- tales like "Madame de Mauves" or "The Last of the Valerii"- depict the drama within marriage, the drama of those who are already locked together. James was also known for his reluctance to end his books with a wedding, and his imagination is persistently drawn to the moment of refusal, to events that don't happen. In his later work he would write about passion with a depth and precision that he could not as a young novelist command, but he would never be comfortable in showing the drama of acceptance. Tolstoy could do that, and Trollope. Not James..."Earlier, Gorra has written about James's homosexuality, choice of bachelorhood, and relations with certain men.
He's very likely to be right. He's the James expert- who am I to contradict him? So far I have only read The Portrait of a Lady and a collection of 4 stories.
What I think is that, even though Gorra can be right, whilst reading the novel I didn't think that James was staying out of an unknown, unfamiliar territory. He makes a choice, and it works. Of course, other writers tackle it differently- we have seen George Eliot do it; we can imagine how Tolstoy would do it. But James makes his choice, and I feel it's the way things should be done. Its effects become its justifications (without making one feel there have to be justifications).