Of course experience (qualitative & quantitative) is what will develop good airmanship. But - good quality training (whether MCC, LOFT, or whatever) should be able to give you a concentrated hit of valuable learning experiences. If you are being suitably stretched in well thought-out and managed scenarios, you can get lots of experiences crammed into a couple of hours that might have taken you years to come up against naturally.
What is needed either in the training or the real environment is a good role model to learn from.