Thoughts on his suggested reading list:
Ideological diversity in science fiction and fantasy was a given in the seventies. We are hopelessly homogenistic in comparison to them.
The program of political correctness of the past several decades has made even writers like Ray Bradbury and C. L. Moore all but unreadable to an entire generation. The conditioning is so strong, some people have almost physical reactions to the older stories now.
All part of the reason that I don’t read anywhere near as much SF as I did as a kid.