It’s all about staying in the story for me. We are supposed to say, well actors can play anybody, their role is to shapeshift. Glenda Jackson played Hamlet etc. However, that might be a rarefied position those in the arts can reach, but for the average Joe viewer who just wants to immerse themselves in a story, it is introducing another element that detracts from the story. I would choose not to see a woman playing Hamlet on stage, but in tv series you can be watching an historical series and suddenly there is a jolt because the casting director has added in someone who doesn’t fit the character.