In the end, we are all in the business of storytelling.
Thought is the servant of action, and action is the servant of survival.
If you're not stubborn, you'll give up on experiments too soon. And if you're not flexible, you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.
A story should have a beginning, a middle, and an end, but not necessarily in that order.