Does Markdown support partials/includes, and does Github honor them? I don't believe it does... (I tried googling about it, didn't find anything, but I could be wrong) so not sure how this can be used as an argument against asciidoc.
> When you take away the include directive you have a less elegant syntax that is harder for contributors to read, much less adopt.
Markdown and AsciiDoc syntax are extremely [0]similar, and AsciiDoc supports markdown's syntax.