So when you are watching these Pixar or Disney films, do you think "Oh, that's Bill Hader!" or "Oh, that's So-and-so!"???
There's a few folks who I could probably recognize their voice without seeing them, but they're a minority. And when I think back on Disney animation through history, I struggle to think who the voice actors and actresses were. Who was Elsa? Who was Aladdin? Who was Mowgli? Who cares? A few rare exceptions stand out, like Robin Williams as the Genie, or Angela Lansbury as the teapot. But mostly, I had no idea at the time and no idea today who the voices were.
But now that we have AI technology that can replicate human voices, and be more controllable and more adaptable than human voices, why not use it? Why does some guy who used to be on Saturday Night Live have to be the voice of a squirrel or a court jester or whatever? Why not just program AI to do it perfectly for much cheaper?