Yeah, but not everyone is trained and training does not necessarily equal retention (I spent the next couple of months after my rebreather course asking other students about points that one or the other of us had forgotten and having to dig up notes or reach out the instructor for clarification -- you don't get really good retention without repetition).  I can also point at recent blog posts which clearly misunderstand the appropriate uses of normal attrs, and where one of our employees didn't fully clarify it (if the wifi wasn't quite so shitty on this plane I'd be able to find it).  We also get a steady trickle of mailing list and tickets where people are fighting with the problem where they've set a normal attr on the node and then deleted it on their wrapper cookbook and its still getting picked up by the library cookbook and they can't understand why.

It'd be interesting to take a survey test a week after the courses to see what students actually were retaining.