Even though we abstractly accept that distraction has costs and depth has value, these impacts, as Tom Cochran discovered, are difficult to measure. This isn’t a trait unique to habits related to distraction and depth: Generally speaking, as knowledge work makes more complex demands of the labor force, it becomes harder to measure the value of an individual’s efforts.
It is ALSO difficult to quantify the effect of distraction or depth (of work) on productivity. Keep an eye on concentration, focus, time taken to finish a task and output.