Writers are less likely to care about what symbol means "bulleted list item", as long as anything that makes sense for it, just works.
It's a mistake to think of Markdown as a programming language, or a "formal grammar".
That being said, if it works for you go for it...
I think I see the appeal of specifying a robust subset of markdown, something that you can trust will probably be parsed the same way for as many dialects as possible.
What also annoys me is that they didn't base it off Wiki formatting. It would've been great if it had at least some compatibility for basic stuff like headings and links.
I would hate to have to change 30 numbers because i want to move an item from last to first.
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1.But the current definition of “its always sequential, that’s it” means you could do it automatically without changing meaning. Whereas do-as-I-say is stuck with being unsafe, always