Disability feature: The Why’s & Why Not’s, and if so, How?

Why is everyone so down on having disabilities in the game? I mean if they make them as realistic as they can then it won't be made as joke in the game like they didn't plan it out. I personally think it should be in the game because the game is a platform based on creativity and everyone whether you are transgender or gay or straight or if you have a disability that you were born with should be able to tell whatever story they want to in the sims. That is what is unique about the game and makes it fun.