Anecdotally, I have found that my focus welcomes slight distraction, in various forms - tv show I already know by heart, stupid silly shows, instrumental repetitive music, music I'm extremely familiar already...
Basically, when I'm at risk to lose focus from task at hand, this steals it, and it's rather boring compared to what would most likely be highly abstract contemplations, totally new ideas and so on, so your focus returns to original task since immediate alternative provided is dull affair.
It somehow "eats up" part of my nature that nudges me to lose focus. It's maybe analogous to how rain noise gobbles up various distracting sounds.
Taking breaks is clearly a good thing, but being externally distracted is not. If you're thinking about where you're going, you're not thinking about how you're going to present your work at the meeting.
Basically, when I'm at risk to lose focus from task at hand, this steals it, and it's rather boring compared to what would most likely be highly abstract contemplations, totally new ideas and so on, so your focus returns to original task since immediate alternative provided is dull affair.
It somehow "eats up" part of my nature that nudges me to lose focus. It's maybe analogous to how rain noise gobbles up various distracting sounds.