My guess is that Hollywood sees "the fat lady" as something funny.
Can an obese woman pull off the same comedy shtick after losing weight?
Perhaps the proof is in the pudding.
I'm not as familiar with R.W. as I am with Melissa McCarthy who I liked before and after weight loss. Of course she has taken on significant dramatic roles. She's great.
So one might conclude a woman doesn't need a perfect body to succeed in entertainment. On the other hand, being young, thin and pretty remains an advantage, right? That's entertainment!