So the actor must be every way, shape, and form like the character he/she is playing? If not, what characteristics must be the same and what doesn't have to be?
At some point, these requirements get ridiculous.
Again, they are actors. The whole point of acting is to be what you are not.
Parts are sometimes lost because you look like the former boyfriend/girlfriend that one of the writers or someone in casting dated who was the cause of a bad breakup. Or they just don't like their looks or they're too good a singer and will overshadow the star, etc. All sorts of stuff happens in casting. It's all subjective. Maria Callas, for example, or any big star or actor at any point in their career, has (or had) a share of detractors as well as fans.
