It has happened to me that I was turned down for an engineering position whose main focus was working with a tool that I had developed the year before, because the other guy had a MSc and I didn't. HR people are weird.
I still have trouble marketing my relevance to technical people, though. I don't have a very forceful personality, nor am I comfortable talking about myself without becoming (in my mind) a know-it-all douchebag. I need help and coaching on that front, too.
(Incidentally - We offer precisely this kind of help and coaching - let me know if we can help! mallyvai at offerletter.io :)
The credentialism in this industry is often infuriating though, I agree.