This is simple economics. There is an "overhead" cost required in order to start a task. Each interruption means stopping, then starting again, incurring this c

This is simple economics. There is an "overhead" cost required in order to start a task. Each interruption means stopping, then starting again, incurring this cost repeatedly. The people who force these interruptions don't care about these costs. Sometimes they're naive but more often they're willfully ignorant.