It's the most reachable thing. Markdown feels like a toy for many (not me)

Oh yeah. Markdown. While it does have a place, the limitations on top of my head as to why I wouldn't use it in bigger projects:

1. There is no standard in that sense, but multiple dialects / flavors
2. No support for stuff you might want, e.g. alphabetical ordered lists.

It's fine for when you know what output you produce, like for Lemmy or in a wiki or whatever. But once you want more control, you lack options or need to rely on non-"standard" (is there was one) solutions to somehow achieve it.

I think, as an easy, yet powerful solution, AsciiDoc is better-suited.