Let’s not start too much with why to write women characters. I’ve already covered that in my piece about racebent Hermione. And I’m not suggesting we all watch out for the Politically Correct (PC) police, either.
If you don’t want to write strong female characters, nobody is going to try to make you. Just, consider wanting to.
I mean, what’s so horrible about including some characters from the 50.1 percent of the population who don’t call themselves men?
Women’s literature is a genre because we need it. We need it in small part because women are different from men; we need it in large part because the rest of literature is largely blind to the needs and even existence of women.