I had exactly the same experience a few years ago. Now a few years later, more of the Racket documentation makes sense, but many parts are still outside of my background understanding. I still have to trade-off the frustration of not understanding for convenient access to all the documentation. Because Racket's documentation is so good, it's easy to navigate to a subject that's over my head.

I agree there is a problem with 'Racket'.

'Racket' can mean an ecosystem distributed with batteries included. It can mean the language referred to by #lang racket at the top of a source file. And 'Racket' can mean any one of several other languages shipped in the distribution.

Racket the language (aka #lang racket) is a useful general purpose programming language. When #lang racket programs address complex problems they tend to become more complex. When #lang racket programs implement sophisticated procedures, they tend to become more sophisticated. Python, Ruby, C, etc. are similar in that respect. The Racket documentation reflects this. There are parts that are simple and self contained. There are parts that are at the edge of programming language design. And they're all in one place.