Here is a link, that describes how P. Jois taught Ashtanga yoga in the very early years.
It's a very interesting article.
As said, many things were changed since the beginning. Too many people wanted to learn Ashtanga yoga. All the compromises that were made on the way made the series not better, but probably more approachable for the masses. I got injured.
I practiced today again. I loved my practice. It was painful. I find more and more ways how to avoid this pain. Posts about this topic will come.