The OP could have avoided a lot of confusion if he began his article like this:

> www. is not deprecated for webmasters (but users don't need to type it)

> This page is intended for webmasters who are looking for information about whether or not to use www in their canonical web site URLs; however, the website can still be advertised without the www and the user never needs to type it.

Even in this HackerNews discussion with technically knowledgeable people I see a lot of discussion stemming form this misunderstanding of what the OP is trying to say. (Example: "I should take the toll by typing www every time? life is too short.")