I am sure there are personality types (probably over-represented among the readership of HN) for whom rigid structure like this is very helpful.<p>IMHO being able to firewall e.g. a three-day trip with the family from other concerns is worth far more than putting in a token 10 minutes in service of an abstraction like this.<p>I would myself take more pride in not having e.g. looked at a screen for three days, than having checked off three more boxes.