You can also be an expert on healthy food, but don't have the self control to actually follow your own advice. In the end, those are 2 different domains. Knowi

You can also be an expert on healthy food, but don't have the self control to actually follow your own advice. In the end, those are 2 different domains. Knowing a certain theory and overcoming all the limitations of applying those are very different. Let me give you another example: Formula 1 or MotoGP. The engineers are not driving the thing, and the drivers are not engineering it. Claiming that one needs to be able to be a master in the other is weird.