>The more productive you are, the more likely you are to get down on yourself and think at the end of the day, “I wasn’t very productive today.”

Wow, that sounds like an incredibly unjustified relationship, with only the superficial support of its counter-intuitive nature. In my experience, the opposite happens, the more you do in a day, the more you recognize and remember that you accomplished that day, and consequentially, feel that you accomplished. Which by the way, is exactly what the anti-todo list is, except with a mental list of remembered accomplishments, rather than manually recorded ones. The latter act should only be necessary if an individual has a particular problem recognizing what they've accomplished in a day; I don't think this is some deep insight or universal principle.