1. Insecurity
2. A team or boss who aren’t capable of providing constructive criticism
Ideally, designers should feel comfortable letting people in ASAP.
The fact is that we designers don’t have all the answers, and more often than not other folks will have insight that you could never have gained without them.
It can be tough to learn how to let go and collaborate efficiently.
Essentially, you can narrow the scope of the feedback by narrowing the field of view.