Someone who is default-out has a mindset of "someone else has to convince me to take this step."

Compare with someone who is default-in, who has a mindset of "I will figure out for myself how to take this step."

Waiting for someone else to do something for you, vs doing it yourself.

Team members needing to be convinced of every detail only works in peace time.

In war time you have to trust the bus driver of the bus you chose to join.