The least productive teams I've been a part of are the ones where everyone is waiting for their turn to say why an idea is bad. Sometimes being "too smart" can hold you back from building something genuinely new.
Common failure mode in environments that promote being the best over getting things done: If you went from school to college to industry always identifying with being better than everyone else, because that's what it takes to get in the door, sometimes you miss the transition to when you're already in the door. A lot of people don't realize they were supposed to put their guards down until it's too late. It's too bad but this is what the cutthroat labor pipeline rewards.