A counterargument: losing focus just means that you are encountering difficulty, boredom or frustration in your current project. Losing focus does not mean you should start exploring other options because you haven't found the best fit yet; other projects that seem shiny now will inevitably go through their own difficult periods. If you look for greener pastures whenever your organic focus starts to wane, you'll neve…
However, I think the article is implying that deep thinking about your values and interests when you step back can help keep you from switching focus for shallow reasons. Perhaps you re-engage with a renewed sense of purpose. However, if you do switch after deep thinking, you'll hopefully be more resistant to further randomization.