> Anyone who cares about Markdown has an IDE available anyway.

I think the point being made is that users who do not care about Markdown will receive Markdown files, and it should be trivial for them to open and view them.

Yes, the article also states “If I want to see the original Markdown syntax, I should be able to switch to that view just as easily”, which isn’t necessary for that use case, but I still think that’s a point the author makes.