Google search only has 60% of my content from 2006

It recently came to my attention that Google has a new Search Console where you can see the status of your web site in Google’s search index. In their usual hand-waving way, Google describes this as:

I read this as “we know this page exists, there’s no technical problem, but we don’t consider it useful to show in search results”. I suspected that they heavily prioritize new over old, but I’ve never seriously considered that Google might be intentionally excluding parts of the web from their index altogether.

Source: www.tablix.org