Every Markdown document needs to have its own group? This will result into too many groups.
This is a matter of perspective, not universally accepted. And obviously you can have multiple related Markdown documents in the same group. They would just share the same Assets subgroup. If you intend to move the Markdown document, yes you could put it in its own group. This is not an unusual or uncommon way to handle things.
And I already said your request is noted.