He said that he knows that he could never make the film 'Duel' now as he did then. That he had to prove himself to the Universal suits and to himself. In his voice you can tell how amazed Spielberg is of what he did back then. And that he is a different person now and the internal fire and drive and the need to do 24 hour days is gone. But on that same note, back then in his beginning years when he was young, he would not of had the insight to attempt something like 'Schindlers List' or 'Private Ryan'.
Spielberg may also be out of touch at times , but at least he can be aware of who he is and his limitations.
Lucas still thinks he's doing and working the same way as he did with no clue how separated from the creative film making process he really is.