If they were then who would be the first to put them right. By the time you read this I will have written it in the past - its history :-)
He starts the book with a quote from Edward Beal : Modelling the Old-Time Railways :- "Railway Modelling is a pleasure rather than a fad and should be free from the pedantry which dictates. Yet our aim in this writing is to indicate a consistent course of action....".
My understanding of this in terms of your question, first you establish what you are trying to achieve be it a perfect scale model (or as best you can build) or an impression of a railway. For the best looking track consider hand built followed by code 75 followed by code 100. However for an impression then the track is less important. So you look at the disadvantages of each such as time to construct, cost, configurations available and what locos will run etc. The book helps you decide your philosophy and relates how the author made various decisions consistent with his aims. He does not tell you what is best for you, nor does he tell you what is the superior method.
Hope my interpretation reasonably matches those of others. Plus as said, its a good read.
Cheers, Simon