It is rather funny that the article talks about markdown when everyone who uses Emacs uses org mode instead.
My .emacs file is init.el which is actually init.org, which isn't an Emacs file but a literate program that's half a guix installation script and half a regular .emacs file.
Also kill all markdown. Replace it with xml or better yet SXML.
I've always found it easier to collaborate using markdown. It's much more popular than org-mode! And you can get org to export text as markdown, so interop isn't necessarily even all that difficult.
And as per the general theme of the post anyway: whatever. Because you can just work around it, whatever it is, by cobbling together some code, one way or another.