yah, often those moments are too short for deep thinking anyway, which really requires contiguous, distraction-free hours. the more pertinent issue is that devices tend to themselves fragment potential contiguous blocks of time and condition our brain for shorter attention spans (just like what happened to me right now, as i was in the middle of doing something else, but stopped to respond!).
Yet I observe people reaching for their phone-distractor device when confronted with a moment of free time.