> This is one of my gripes with psychology articles/self help books. So so many topics are simple 'revelations' that many of us have figured out by the time we are 20. Can't eat a cookie if you don't have any cookies.

I recall Scott Alexander talking about this on one of the SSC posts -- can't remember which -- about the fact that people miss developmental milestones for reasons. And you can ask the question: What developmental milestones am I missing? Or: which cognitive tools do I need for my toolbox?

It's good to teach things that "you should already know", because maybe you're one of today's lucky 10000.