"Incomplete" depends on the application. Markdown is intentionally a small and simple language, so it's fine for e.g. comments, but too limited for e.g. a full documentation.
(and as a result, it's tended up to spring numerous incompatible extensions e.g. TFA talks about Pandoc Markdown which adds tables, footnotes and a bunch of other stuff, not "Original" Markdown).
> somehow my AsciiDoc documents turn out looking better
Maybe it's just the default style of the Asciidoc HTML renderer, something like that?
(and as a result, it's tended up to spring numerous incompatible extensions e.g. TFA talks about Pandoc Markdown which adds tables, footnotes and a bunch of other stuff, not "Original" Markdown).
> somehow my AsciiDoc documents turn out looking better
Maybe it's just the default style of the Asciidoc HTML renderer, something like that?