A German with extensive experience living and working in the U.S. made this comment:
“I more observed that you make easier commitments in some cultures, and somewhere it takes more time. Then, in some cultures you can adjust when the boundary conditions dramatically change, and in others you stick to you word whatever happens. I guess that probably is the concept of Nibelungentreue, which has both positive and negative implications.”
About Nibelungentreue see what Wikipedia has to say here.