Everyone seems to forget Markdown was invented for humans and incidentally for machines.

Almost everyone who complains has some parser or rendering related agenda. No one cares if you can't nest asterisks inside underscores. Most of these edge cases don't read well as Markdown, which defeats the purpose.

>Everyone seems to forget Markdown was invented for humans and incidentally for machines.

We already had plain text for that. Markdown was invented to be converted to HTML. It has no utility over plain text otherwise. The link and image syntax is doing what HTML tags do, but are less readable for people than just pasting the URL. The relationship to the machine isn't incidental, it's intrinsic.