There is nothing fundamentally wrong with doing it for the money. However, for many people who are only in it for the money and do the minimum necessary additi

There is nothing fundamentally wrong with doing it for the money. However, for many people who are only in it for the money and do the minimum necessary additional exploration in the domain - if they find that they need to switch technologies or domains they may not have practiced enough to be able to make that switch in a timely manner. On the other hand, people who continue to explore outside of the "this is what is needed to do my job" will be more likely able to adapt to a new stack or show to a interview panel that they are able to change to fit the needs of the organization.