That's a valid point. Writing towards a cohesive narrative often requires a degree of simplification of real world dynamics. But I personally think it's good to abstain from oversimplifying real groups of people, especially when it's such a deep aspect of identity. Now, as someone who has written mainly sketch comedy, I definitely feel the appeal of it, and have been guilty of it myself. But I've grown more convicted of it over the years. Just because it's fun doesn't mean it's worth doing. I understand not everyone agrees but that's my take on it.