It's important to remember the best design wisdom may come from anyone on your project team. And the best way to empathize with the users you design for is to understand where your ego starts and stops as a designer and thinker. It's easy to make biased design decisions based on your own, albeit compelling perspectives that may not be relevant.
Good discussion of ego and professionalism on the Love Your Work podcast.
"The strength of our ego boundaries is the result of each properly resolved developmental crisis."
- John Bradshaw
"Innovation is the state once drama is gone."
- Cy Wakeman