The 4th Turning is a complex book and for most people is very difficult to digest. I found that I understood the gist of it after the first reading, but due to the plethora of archetypes, etc, I wasn't always able to utilize the book without further reading, studying and memorization. Now, after several years of reading and studying it I find it helpful as a "paradigm" through which to view the events past, present and future. And, frankly, the only other book with the same kind of powerful paradigm is the Book of Mormon. Both demonstrate that a cycle of events exists in the affairs of the western world (or the Children of Israel.) The 4th Turning (the book) describes it as a saeculum or 80+ years during which society cycles through four distinct phases or turnings. And within the book the term "The 4th Turning" refers to the fourth stage of the saeculum where a Crisis period always seems to develop in the westeran world (since Columbus) where everything will either break down completely or society step up to meet the challenge and turn the crisis events into renewal. The Book of Mormon describes the cycle in terms of pride vs humility, i.e. forgetting God and His lawa vs remembering God and keeping His laws. When people are humble, repent and serve God and mankind they are blessed both spiritually and temporally. Then predictably they forget God and where their blessings derive and consequently they fall into conflict within and without their families, communities, nation and world. Then as the result of wars, pestilence, etc, they are again humble, repent and are blessed spiritually and temporally, etc, etc.
There are only FOUR archetypes and only FOUR turnings. Not sure that qualifies as a plethora.