I also wonder if skaters who constantly move from coach to coach miss out on some of the natural progression in their technique. For example if you learn a loop jump in a group lesson you will probably learn to do it from a 3 turn entrance with your arms and free leg open because that is easiest for most people. If you move on to a private coach they might want you to start entering the jump from back crossovers which give you more speed. After you master that, they might start working on having you retract your arms and use your free leg to get more lift. Some coaches will start with the most difficult approach first, some coaches will use the gradual approach but may focus on the skills in a different order. Mastering triples would also require off ice fitness training as well. How much can you accomplish if you only spend a year or 2 with each coach?