Sometimes, we get stuck in our bubble, and our thoughts and ideas go in circles. At the same time, people around us share similar thoughts and ideas because we typically hang around people like us. Or, you've been in the same industry for years, and the only "new" ideas are recycled. That's when we need to listen to outsiders because they'll bring a unique and different perspective. It's similar to when we watch others play chess, the chess board seems to be so much clearer as opposed to when we're playing. As an outside or bystander, we are less likely to be clouded by our bias, investment, and emotions.