Excellently conveyed Joe - this filled up any holes I had in my understanding too.

This actually changes the whole game for me - I was using Medium as a "documenting" platform mostly - writing about the things I AM learning and not much about the things I'd already learned and mostly mastered.

Now, I see this is a service, not a selfish self-exploration - the things I've already "mastered" are quite valuable to those just beginning to or not yet acquainted with the same. It's for such people that my (l)earned experience can be a massive boon.