This is a mathematical analysis built on unstated assumptions of how long the brain can focus on something in the long term. By this line of reasoning, 4 people working 168-hour weeks would be maximally productive, but they wouldn't be sleeping, so obviously the purely mathematical argument falls down on its face.
My point is, knowing that turning dial A up doesn't help doesn't mean that turning dial B up does. It just means turning dial A up doesn't. Sometimes the reality is that turning neither dial up is the only option, and you have to plan around that fact.
In reality, there's decent evidence out there to support the statement that turning dial B up can be just as counterproductive as turning dial A up unless it's done very judiciously.
My point is, knowing that turning dial A up doesn't help doesn't mean that turning dial B up does. It just means turning dial A up doesn't. Sometimes the reality is that turning neither dial up is the only option, and you have to plan around that fact.
In reality, there's decent evidence out there to support the statement that turning dial B up can be just as counterproductive as turning dial A up unless it's done very judiciously.