Distraction is bad!
The short-term distractions are visible, but long-term distractions are not visible. here it is how!
you can see the downside of distraction in the short run while you are trying to finish a daily task, like studying or doing office work. if you have distractions, it is obvious you will not be able to finish the task as planned resulting in frustration and unwanted delays.
the same thing happens in the long run. imagine you set a new goal in life that may take a couple of years. if you consistently work to achieve that goal, you will definitely achieve it. but if you have distractions, you have a change of plan after every few months. you will be nowhere at the end of two years. thus long-term distractions are less visible but more catastrophic in the long run.