Because Nick's experience has changed so much over the years since the site was initially created, as has his perspective - though the approach and teaching has not actually changed; just the depth of the realisation - it seemed as good a way as any to display the pages in chronological order in which they were created, rather than collating them in groups of similar subjects. 

It's perfectly possible there are other pages as well as YouTube videos by Nick that take the descriptions and explanations deeper still. But the early pages should still be of some assistance to  others coming behind.