As well as the texts based off his lectures. [1] His ability to teach was completely unreal. Those 'books' dramatically deepened my understanding of physics.
This is not quite accurate. I mean it is, but only in the same sense that a top 5 chessplayer in the world might regularly bemoan, with no irony intended, his inability to play chess well. There's a lot more context to his comments here. [1]
Seriously, if you are at all interested in physics - read the lectures and they will, with 100% certainty, deepen your understanding. Even on the most fundamental topics. For instance my entire worldview around the conversation laws changed thanks to those lectures, which in turn ties directly into the nature of energy.
Probably because a lot of us have read or watched his work and know first hand that it was extremely high quality. It's not like you have to take people's word for it.
The Feynman Lectures on Physics was used as the textbook for Caltech's introductory physics course for nearly two decades, and it is still used in some universities. I learned physics from it and have met many Caltech alumni who used it as their textbook, all of whom felt they learned a great deal more than "intuition" from it. So I am guessing you've never actually tried to learn something from it if you feel that way.
I'm very aware of the "spherical cow" joke about physicists, but this isn't a "random celebrity".