[eterevsky]

It is true that Markdown won by putting simplicity for the users in front of simplicity for the parsers. But since it became ubiquitous, there's a lot of value in codifying the standard to make sure that it doesn't diverge into different dialects.

Regarding the specific author's suggestions, he explicitly writes that he doesn't propose to implement them in the actual MD "standard", since backwards compatibility is more important. That said there is value in making the markup less ambiguous while preserving the "writability" even if it's just a thought experiment.