There's also the subject of fear and courage-a lot of people will hesitate to share their thoughts because of the backlash they think it will stir. Any feedback, positive and negative, is extremely helpful. One directly bolsters confidence, the other inoculates you to the ire of others over time.
If you've got big plans or big ambitions, or even if you just want enlightenment, somebody's gonna ride your ass. This kind of environment is a perfect testing ground because the potential consequences are constrained by the medium. You get used to saying what you think here where anyone can see it and respond, it gets easier to say it in front of people who are sitting across the room from you. That is a situation where welcoming a bit of pain in the short term pays dividends in the long run.