(Dr. Wolfram is in in my FB friend list, I am not tagging him, lets see if he finds us talking through him, about Feynman)
(Wolfram) You’re a great speaker; what are you worrying about?” He (Feynman) said, “Yes, everyone thinks I’m a great speaker. So that means they expect more from me.”
And in fact, sometimes it was those throwaway conference talks that have ended up being some of Feynman’s most popular pieces. On nanotechnology. Or foundations of quantum theory. Or other things.