To be fair, John Gruber offered up a completely deficient “standard” and a buggy as hell Perl parser implementation. Yet still wears “I created markdown” as a feather in his cap, strongly insists to this day that it was a good idea, and says “the canonical markdown docs are on my blog! Nothing else is markdown!” Things like CommonMark were absolutely integral to Markdown’s current success. It was way more about fixing John’s mistakes than adding more functionality.