Well, they don't want to make him totally out of character.
I dunno how you could keep Sasuke in character at all and have him in a real marriage.. Unless it was with someone who's hopelessly enamored with him and masochistic /likes being Genjutsu-killed. The writers seem to want to preserve Sasuke's lone wolf/ dangerous renegade faux coolness ..and that just doesn't work with the role hes been put in ..married life and raising a child. (at least not the way they have tried to write it) It's a real mess..