I think that it is simply a matter of inexperience. In general, recent grads are no where near ready to go out on their own. Granted, there are a few that can do it, but they seem to be the exception. One thing that you realize quickly when you get into the field is how much more you have to learn. School only lays the foundation for you to build upon. Going out on your own requires a lot more than just a few sketches, a great render, and the design process as a whole.