It must be a pain to make a text box with the ability to add bold, italic, heading, etc. you know? All the bold text, italics, and headings would need to be saved in a database column to be retrieved later in their correct positions.
I don't know, I am doing internship learning C# ASP (started 2 months ago), and just got a "Shower Thought" while making an edit post function.
Markdown has one huge adventage, if you remember bit of syntax you can type it right from your finger, it's a great speedup for me. I personally prefer orgmode but noone uses that in XXI century.
Yeah, but that's not what we're talking about here.
RTF has many more features than markdown can reasonably support, even with your personal, custom, syntaxes that no one else knows :/
I use markdown for everything, as much as possible, but in the context of creating a RTF WYSIWYG editor with non-trivial layout & styling needs it's a no go.