Yep. Agreed about Lucas, and that's an interesting way of putting Kubrick.
He is better than just about everyone with the perspective--an argument could be made for Hitch, but he was better than everyone at everything.
However, I think Kubrick often used it as a crutch. In many of his most famous shots, especially later in his career, it became the only focal of the frame. There was nothing going on, and if you were to omit the perspective element, the frame literally loses all its depth.