Given that modelling is at the heart of NLP, it's really important that people begin to explore for themselves just how to do it. What about someone who has just finished Practitioner training. This really is a matter of learning styles. I think people should do whatever feels right to them . Many people really enjoy the continuing stimulation.
Some people come back a year later.
From experience I'd say it's absolutely fine to keep going - but go with what feels right. They presuppose familiarity with the field, certainly to Master Practitioner level. While we want to make the material as widely available as possible, I feel very strongly that we must ensure that practitioners have the requisite skills to be able to deliver in real life situations. First they are happier. They know more about how they can shape their lives and in the process they often achieve new professional goals by using the tools that they have learnt.