I find statements such as this to be profoundly anti-intellectual. It suggests that we can't become better at what we do and need to be stuck at the level of "a beginner can understand that".

Now, I agree that simplicity is a virtue and that some people go overboard with crazy stuff just because they find it cool. But, as Rich Hickey says, there is a difference between simple and easy. If a junior dev doesn't understand "map", then we should explain them what "map" is, instead of going to back to writing everything with for loops.