If two to three seconds of waiting (that's on the high end, and only for certain apps) is breaking your flow, you need to work on your attention span. That's ADHD territory.
Edit: For that matter, interacting with your phone for a few seconds at a time is probably an attention deficit issue in and of itself. I admit that it's common, but that doesn't mean it isn't a problem.
Edit: For that matter, interacting with your phone for a few seconds at a time is probably an attention deficit issue in and of itself. I admit that it's common, but that doesn't mean it isn't a problem.