I am completely in accord with you. There are steps back and leaps forward. In my experience,I noted there are moments of accumulation of information and practice and then, sometimes unexpectedly, there's a qualitative leap.
For many years I was most focused on my disability and I blamed others because I didn't achieve my goals. This year I changed my mental attitude and now I concentrate to my goals. Your article is very interesting because you do clear examples. Thank you.