True there are billions of concepts but if you think about it, a few concepts explain a ton of things. For e.g., incentives. A simple concept in theory but apply the right incentives if you are leading teams and you'll see a whole lot of improvements. And that's the beauty of mental models. You don't want billions of them. Maybe 20-30 of them have enough applicability for most of the things that you might want to change in your immediate milieu.