I liked your point:

If you feel insecure, just understand that you can always show flexibility if something goes wrong.

For a long time, I was very rigid in my plans and would feel like a failure if events didn't unfold as they did in my mind. I had no tolerance for things I couldn't control. Now, years later, I have such a sense of peace just beginning projects I know are good and tweaking decisions as I go. Nice "food for thought" in your post. Thank you for sharing.