Congrats on building and shipping something!
That said, from the original document about Markdown[0]:
> The overriding design goal for Markdown’s formatting syntax is to make it as readable as possible. The idea is that a Markdown-formatted document should be publishable as-is, as plain text, without looking like it’s been marked up with tags or formatting instructions.
From my experience, the benefit of Markdown is that it eliminates the need for WYSIWYG, because WYSIWYG is awful to work with.
Put those two things together, and it's weird for me to see Markdown used like this. Not saying it's wrong or bad or whatever, just that it's weird and seems to cut against the spirit of the thing.
StackEdit[0] pretty much perfected what I needed out of a markdown editor - I just need somewhere to write my tickets/docs that wasn't Github so that I could format it properly while writing. I still use it from time to time