Yes, I agree with you that it is no good to have all the yes men surround us if we need to grow in maturity or step up to another level of success in our life. My experience told me that we do need to hear different opinion in our team which are willing to get the job done in a better way. However, in a private setting, I prefer someone who really knows me and loves me that will give constructive criticism or advise for our improvement. There are so many people in this world who loves to share criticism out of love but just to release their anger towards the other person and end up really hurting others. This kind of opinion with such an negative attitude is not recommended in this world. We need more positive people to share both positive or sounds negative comment with love. However, I think it is hard to expect others to have such an attitude in reality. But one thing we can do is to start to share our opinion to others with love, then it will start to impact the life of others.