"i have now realised that to be a good dance you not only need to have the skills but also the right kowledge of physics to seperate you from the rest."
No, you don't, and probably only a minority of top dancers do. It's enough to do it the right way, it doesn't matter how you got there, and simply having a teacher who is really teaching it right is the usual method.
What thinking through the physics of the situation does is allows you to figure out, when world-class authorities disagree on something, which one is right, and which one got where they are on the strength of other areas rather than the specific topic under discussion.