The more you do the same thing over and over again, you tend to gain more knowledge about it and improve on it.

You are absolutely right about this. The more an individual carries out a particular task , the more he familiarises with the whole process involved. There are cases where someone is seen doing a job he has zero knowledge about.

But then, life works in different ways and also, given the situation of the country, relying on one career is a risk. One can never be too sure of holding onto his or her job for as long as he or she wishes. There are possibilities of unwanted occurrences.