I've tested MD and honestly I don't like it. Bold/italics add unnecessary noise/clutter and the font is already monospace, suited for code, so inline code & code fences are not needed. If 3rd party clients want to implement them it's fine but I'm sensitive to visual noise.
Maybe implementing a subset of Markdown would be a good thing. I am thinking about bold, italics, inline code, and code block, mostly. Oh, and links.