I'm speaking specifically about women's SPEAKING voices. In the 50's, I think it was critical for a woman actor to have a lovely voice. The voice of some women in Hollywood at the present time are grating and, I think, subconsciously affect their popularity. I noticed that someone must be couching Courtney Cox because there is a difference lately for the better. It might have to do with insecurity. Ellen Pompeo has a lovely speaking; Katherine Heigel as well. Comedians seem to be able to get away with, or perhaps be enhanced by, less beautiful voices than dramatic actors.