Thank you. I understand that office space, personnel, and financial benefits are big advantages in startup company. The other points you are making might become

Thank you. I understand that office space, personnel, and financial benefits are big advantages in startup company. The other points you are making might become disadvantages, especially for those that do not have good outside guidance. My understanding is that organizations like YC help you "trim" your ideas and stay focus. One might even think that YC is something like a board of trustees or senior management. Obviously, without the part where if everyone thinks your approach is really bad idea they will not let you do it.