Rather than creating the markdown for a specific renderer, I think you should focus on creating markdown that can be easily read and edited - so no "######" hea

Rather than creating the markdown for a specific renderer, I think you should focus on creating markdown that can be easily read and edited - so no "######" headings, no quoted text or horizontal lines, basically no clutter. Then how it appears in HTML can be tweaked by the renderer and via CSS. Also I assume clean markdown would generally look better in most renderers.