Today we are living in the expert world so we don't believe on our own ability to see, understand and apply our own ideas on our dance. We want quite exact guidance from a teacher and we want to get forward at racer speed. This gives us a very strong from outside to inside learning and we create a more homogeneous pista, less variation on a figure.
In the old world the dancers were watching the skilled local dancers and then tried to do something similar. The learning was from outside to inside but I think that the results were more or less individual.
There are also stories how a dancer wanted to go around and found a way to do so. All the results were different creating a jungle of movements and an utterly diversified pista.The learning was from inside to outside.
To learn from youtube is a kind of modern variation of this old type of learning!