[josephg]

Rich text isn't just bold and italics. It also (often) supports tables, embedded images, links, fonts + font sizes and colors. Markdown supports a poor subset of that stuff.

And its not just for "humanity's lowest common denominator". I love being able to copy+paste a table into an email and have it show up correctly. Today's convention where I have to screenshot something to show it to you is horrible.

Markdown isn't the right tool for every job. Would you use markdown to typeset your resume? To write an academic paper?

Lots of popular applications - like Notion or Google Docs - need something more powerful than markdown. And the current javascript APIs are failing them.