Any 'important' field is infinitely deep and never allows one to accomplish everything because no one knows what there is yet to achieve. A physicist does not q

Any 'important' field is infinitely deep and never allows one to accomplish everything because no one knows what there is yet to achieve. A physicist does not quit just because they recieve a nobel price, for instance - "Ok, I've contributed all I wanted to contribute". The question is, is the chosen field 'incomplete' or 'complete'. If the entrepreneurs goals is just to cash a check then his chosen task can be completed. If it's 'bring X to market and let others finish it' likewise. On the other hand, if the business becomes the entrepeneurs baby and they just want to nurture it I'm not sure if that path is necessarily ever complete.