My biggest worry is that people may rely too much on this instead of, you know, RTFM, by which they'll learn a lot of useful stuff, especially those concerning safety.
Agreed. Some people view as this as a replacement to a manual and others as a complement to a manual. Bottom line, I wish I had this resource 10 years ago when I wrote my driving test, the content is free, and the website (and especially the apps) do a much better job of engaging 16 years old than a manual will ever do.
Totally. I read the whole manual when I did my driving test, but I still got some a copy of the questions they'll ask to review just before the test. This is definitely a much better choice than some source-unknown papers :D