I see what you mean and agree. Actually Culadasa has a very precise way of describing what happens in this case - sustaining attention on a single object allows

I see what you mean and agree. Actually Culadasa has a very precise way of describing what happens in this case - sustaining attention on a single object allows peripheral awareness to be more clear (in a way that looking at the flagpole allows to see the wide patterns of clouds moving in the background). When attention moves, on the other hand, its changing content is too prominent and it foreshadows the awareness. And it's the awareness, not the attention, that allows us to see the entirety of the mind.