I mostly agree with the author, but I don't see the point of stopping yourself when you're "in the zone". Why lose the flexibility? What works for me is having a baseline of 3 or 4 hours of daily work, and not imposing any hard limits when I want or need to do extra hours. This works out great, because I have no excuses not to do the boring routine work as it's just a few hours, but I also have the liberty of doing o…
The author thinks in the long run the 10h sessions hurt you. They acknowledge specifically that got a week long exercise more work will produce more results but that they feel their average productivity is much higher over months or years by never getting bogged down even when they're making progress.
I think the lesson to learn from this is that we should work harder to not only remove the stigma of unusual work schedules, but encourage them so people can discover their maximum productivity schedule for themselves.