Like any artistic field, the 3D animations too do have different levels of performance. Thus the higher experience and ability does create works that are at best more expressive than what an amateur would be able to produce.
The key role played by the advanced training methods must be understood in the light of the fact that often key advances in the field of work needs to be imparted to the student. Or it could be that people do tend to branch out to different areas of work after a brief introduction to animation and it takes the advanced courses to lay a stress on the finer points in the field of 3D animation.
Picking out the better training institutes
An important element in the training of people in animation is that there needs to be an application from the person undergoing the course. It is never as though by just attending the classes the student is capable of achieving results. More than the institute of training, what would be more relevant would be that there is good experienced faculty to impart the teaching.
It does work to the convenience of the student if the particular institute would allow flexibilities in their programs. Often this is an important factor to those working executives who would want to build upon their skills.