I have never seen a script that hasn't gone through at least eight different iterations before they even begin filming, and frequently what is filmed is not what's in the script, because things change on the ground. An actor can't say a particular line. An actor will have a brainstorm and ad lib something utterly brilliant.
Cultural concepts are one of the most fascinating things about historical fiction. There's always a temptation, I think, among some historical writers to shade things toward the modern point of view. You know, they won't show someone doing something that would have been perfectly normal for the time but that is considered reprehensible today.
Whenever you're dealing with something that's difficult to describe, that you can't get across to someone in a sound bite, it sounds like the normal default is to pick what's easiest, and in the case of fiction written by women, fiction involving women, fiction involving any sort of relationship, the word that comes to mind is 'romance.'