This is such an important idea because it is rarely considered by many. For example my mother is really good at off the cuff/impromptu speaking and she mainly relies on that. She tries to prepare sometimes but considers it unimportant as she can always come up with something new on the spot anyway. Often entertaining but off-topic.
I agree that it is important for us to be aware that over-relying on our strengths sometimes makes us complacent and creates the tortoise and the hare situation. If we cease to improve and rest on our laurels, we may end up the laggard.