The author has clearly never heard of decision fatigue.
The mind is a muscle and while it can be strengthened, like any muscle it has limits. As one grows more experienced and gets a better understanding of their mental faculties, they come to realize — subconsciously or not — that they are only good for so much thinking in a day. Thus extreme measures like the Steve Jobs-ian "uniform" and chugging soylent instead of wasting five precious minutes every day pondering what to have for lunch.
I've been immersed in "startup culture" for just over a decade now, and if I have one acute observation, it's the shift from "never not working" as an ethos to obsessing over not burning out. There is an entire genre of people thinking very hard about mind-hacks to avoid it (yes, irony alert). Looking forward to when this dude slams into the wall.
(I'm guilty of the "uniform" strategy, incidentally, went to H&M and bought 20 identical black t-shirts and 10 white button-up dress shirts, best decision ever)
((second best decision was scheduling all meetings for the second half of the afternoon))