The human brain is not made for multi-tasking. Multi-tasking will always be a productivity and focus hit. This was the point of the article.

> To me, this is similar to being honest. You don't want to depend on a system or checklist for being honest. It is something you always need, as a policy. Focus is like that. If you want to focus seriously on something, just make it a policy, and don't use all these tricks as crutches.

I found that I need a lot of guardrails and "crutches" as you said to be at peak productivity. Maybe something is wrong with me, or maybe it's the Dunning-Kruger effect.