What's your biggest frustration when writing or collaborating on markdown?

I've been writing markdown daily for months and I keep hitting the same walls — needing an account just to start, clunky collab, bad exports.

Curious what bothers you the most? Things like:

1. Writing experience (editor, preview, formatting)

2. Collaborating with others in real-time

3. Exporting to PDF, DOCX, or other formats

4. Sharing docs with other people

5. Something else entirely?

Building something to solve this and want to make sure I'm not just scratching my own itch.

What would your ideal markdown tool look like?