I'm not sure I would caution against AsciiDoc, but I stopped using it personally due to lack of support, and Markdown (of various flavors) being good enough for the use cases I cared about at the time.

There isn't much tooling. The community is small. The spec effort seems to have stagnated. AsciiDoctor and related projects seem to move at the speed of what Dan Allen decides is most worth his time.

That said, I've been wanting to do more long form writing, and AsciiDoc is lovely for that, so I may pick it up again for that.