Asciidoctor is much more powerful and uniform than Nostrmarkup (that's what I call it). I just use NM for everything except 30041s and 30818s, where I use Asciidoctor and add in some Nostr-y stuff, like rendering npub handles.

We only defined a handful of tags, for NM, and everyone has already gone off and implemented them differently. GitHub can enforce GH Markdown because they control the app its displayed in, and if you don't format it like they say, it looks garbled.