The standardised websites offered by the rail companies are good up to a point, but it is much easier to use the book if you want to plan a trip involving changes, be it just a cross-country journey or a some complex rail tourism. Websites use standardised (and conservative) times for changing platforms or for crossing London by tube. The book will tell you whether you can get an earlier onward train if you are prepared to take a chance on making a speedier connection, or whether there is a different route that may be more interesting, and possibly cheaper if you then check the websites to price by the leg. Hooray for Middleton Press for keeping this going!
Websites and apps will complement the book, to check nearer the day or during the journey that there are no changes or delays.
Despite an increase in the format size, the print is still painfully small. with tables typically two to a page where the previous official original would print one to a page. I'd pay more for bigger.
I guess that there are many who just find pleasure in sitting in an armchair and creating imaginary journeys.