Earlier quoted context omitted.
Feynman was a uniquely gifted teacher that made things intuitive and simple. Those other books are course textbooks for physics majors, and they require an order of magnitude more effort and time to understand. When I was a physics student the best students seemed to use both types of materials simultaneously. A work like Feynmans would give a bigger picture and more intuitive understanding of what is going on and he…
Bang on.. Several thought experiments and constructs he would present in the lectures will elucidate/challenge a foundational concept in such a manner as to lead an inquisitive reader or student on a quest to absorb the extant knowledge just to be able to answer the conundrum satisfactorily. Many of these have since become classics.
A textbook that just plainly presents the facts about a specific phenomenon isn't necessarily training you to think like a theorist, in the way Feynman is.