My understanding is that "Rich Dad" is a combination of a few people, possibly including Keith Cunningham, who wrote "Keys to the Vault". Keith is great, saw him at an Anthony Robbins event.
Most people need to know WHY they should learn something to be motivated enough to learn and implement the WHAT and HOW. The Rich Dad book is great at WHY and some WHAT....very little HOW, but there are lots of other resources for HOW, including BP.
For the literal thinkers out there that believe that the best way to learn is via Non-fiction, remember that most of the best teachers in history used parables, metaphors, fables and other fictional methods of teaching. This is called inferential learning which can bypass our critical faculty and relay information much more effectively. Do most people relate more with the Star Wars characters or to their high school biology book? There is a small percentage that answer the biology book. They are likely literal thinkers/engineers/scientists.
Since almost every BP podcast guest gives props to the rich dad book, there is probably something there to take away. I personally got a lot of useful pricipals, mindset and ideas including: Limit your doodad spending and invest in income producing assets, personal residence is not an asset unless and until it produces income, ESBI, tax-reduction ideas, etc. and more importantly, I still remember much of what I learned from the book even though I read it only once over a decade ago. That is the power of inferential learning.