Ironically, you chose Jane Mansfield for the question picture. Ironically for me as I have always thought she was one of the most beautiful celebrities of all time. Well, Jane Mansfield and Maureen O'Sullivan (when she starred in the first Tarzan movie). Both these women predated me, but their beauty is timeless.
That said. I understand what you are saying and I agree. There are some amazing actresses who are beautiful and amazing actresses who are not considered by many as beautiful. But what is considered beautiful at any point in history is what the media and film put on the big screen. I consider it sad, because although I appreciate beautiful women no less than the next person, I also appreciate acting talent. For me what makes a film a success is the actor's portrayal of their character. If I believe that person to be their character then I am drawn more deeply into the storyline.
Typecasting is an obvious problem in films, and many times I get the impression that it is justified. What I mean is that the actor has no real talent. The actor is merely playing themselves, not a role. A real actor is one who can play a role that is nothing like themselves and can make me believe them.
For lack of time, I cannot go through a number of talents as I see them, but I will give one example that quickly comes to mind. Jessica Lange starred in a King Kong remake in 1976 playing a campy Dwan, the apple of Kong's eye. I have no doubt her beauty had a lot to do with her getting that role; not her acting skills. But Jessica Lange also starred in the movie Frances about the life of Frances Farmer and she was amazing.
In my opinion, there are too many bad movies starring actresses and actors hired for their outward appearances and not their inner talents. Some of them should not even be called actors. And some of them never get a chance to display their real talents. It is a shame that the market is one perceived as desiring beauty over talent, whether that desire is valid or not, because so much talent goes to waste. So much talent is never seen or realized.