> Otherwise, why chose the book at all ? After all, as you said, it's almost impossible to adapt, so they didn't buy the rights for the writing.

I mean, Apple bought the show from a production company that was able to get adaptation rights from the Asimov estate, and presumably that production company had creative people who liked the series and were motivated to adapt it. It's not like there was some white label series already in development and Apple went searching for some famous book series brand to attach to it.