I don't know that I would put it that way, though maybe you could choose to. I have no trouble focusing for long blocks of time on tasks I'm engaged in, or even on any of my work in a week where I'm feeling motivated, but the problem is there will be days where I feel like I spent the whole day working (doing code reviews, answering questions, doing things for other people, etc.) but didn't get any of my project work done. I think those days tend to happen around boundaries where I finish one of my tasks and have to pick up a new significant task that I don't feel pushed to get started with for one reason or another (maybe combined with external life factors). A lot of other software engineers I've talked to can relate to this, so I don't think it's just me. This system is more for me to smooth out my productivity so I can make sure that I'm always getting some of my own stuff done and not just doing "filler work". The "intentionally doing one thing at a time" thing also just makes me feel a lot better and makes it easier to blow through an entire day with almost no distractions. There have been two or three days that were Fridays I think where I decided to take a break from the system just for a day and it's really remarkable how much worse it feels :)