His times were examples, not generalizations, but you spend that time anyway no matter what method you choose, even if your choice is no method at all. Inevitably you will have to think about desired outcomes, next-actions to reach those goals, and priorities. Why not externalize that thinking so you only have to do it once, and batch process it for efficiency?

When you choose “no system”, you're simply deciding to keep those things to do in your head, mentally reiterate and evaluate those lists, and reprioritize them throughout the day. It's true whether you think about it in those terms or not. How that could possibly be more efficient than using an external system (pen and paper) to capture that work is beyond me.