How far you go with your leadership is directly related to how comfortable you can be with your discomfort. It's going to be harder to lead at your greatest edge, grow people optimally, have hard conversations, hold boundaries, and stretch out of your own comfort zones if you're not comfortable with being uncomfortable.
How well you can hold space for another human being is directly related to how comfortable you can be with your discomfort. It's going to be harder to hold space for someone to be in their own pain, to be angry, to be struggling, to be in their own discomfort, (or even to be fully shining and rocking it!), if you're not comfortable with your own pain, anger, struggle, discomfort, and shining.