Books Aging Poorly: Scott Cunningham’s “Wicca”

Scott Cunningham's "Wicca: A Guide for the Solitary Practitioner" is now over thirty years old, and parts of it have aged poorly. It's certainly not a bad book, but it's very much a product of its time. Wicca, Witchcraft, and Paganism are constantly evolving so this shouldn't be much of a surprise. Most Witchcraft books don't age we why would Cunningham's "Wicca" be any different?