Actually I find that page relatively nice and well structured, not looking like some concated man pages from the 80s. And there are probably lots of experienced

Actually I find that page relatively nice and well structured, not looking like some concated man pages from the 80s. And there are probably lots of experienced people (I know some) who had relatively little Linux contact before, who somehow ended up on it, doing web development exclusively on the app layer with occasional contact with the rest of the environment, who would be happy to have such a resource. It has an ok balance of in-depth understanding and concrete examples, which is not always true for man pages, and it is structured differently ("problem -> understanding -> solution" rather than "solutions -> understanding of the solutions -> find the correct problem").