> This essay could have been a prompt.

Doesn't look like this to me.

The main point of the essay is that MD files should be supported on an OS level. This way, you could share an MD file with anybody, and it will “just work”.

You could develop your own viewer, but this will not solve the problem of “just working” for every user. Because most users wouldn't install some app just to open the file you shared with them. The same way you don't expect users to install any software to open websites, images or PDFs.