An even funnier aspect is that he was well aware of a today-still-unsolved problem, which he thoroughly expounds in Feynman Lecture chapter 28 volume 2: the mas

An even funnier aspect is that he was well aware of a today-still-unsolved problem, which he thoroughly expounds in Feynman Lecture chapter 28 volume 2: the mass for an electron, with all the historical attempts at fixing the theory, and he mentions (correctly) but does not show that even in quantum version the problem remains, and even though he knows theres an inconsistency (i.e. electron mass if finite, and infitine, a simple contradiction), he goes through all different attempts at resolving the problem, and for each attempt at solution describes why that way of trying to remove the inconsistency is doomed... he keeps the best argument to the end... the sledge hammer, that there is another electron like particle (muon), with same charge, but totally different mass... the only conclusion is that point charges must be composite! EDIT: my comment seems random the way it is, but the quote implies that a theory must be correct/consistent in order to matter at all... while he knows there is an unresolved inconsistency!