I greatly prefer plaintext in most cases where Markdown ends up being used. WYSIWYG is more useful than formatting in these cases. Most of the formatting makes it harder to read anyway. Some say you can ignore MD and treat it like plaintext... not so when you use a newline.

Oh and now you could have LLMs write the Markdown, but chances are no human reads that, or even if you do, the formatting is going to be insane. I have to keep telling Claude to give me a .txt instead of .md when asking for a context dump. Maybe .md is popular for agent readmes because they optimize around its headings.