I very much despise the trend to write sharepoint or wiki/Confluence pages as a means for software documentation. I want my documentation to reside next to my source code, not at some obscure corporate URL.
The problem is simply that github, gitlab, and friends adopted Markdown and so it's got a heavy head start. Asciidoc is competing with small snippet documentation like README files written in Markdown and wiki pages in Confluence, Sharepoint, and the like. Asciidoc is pinched in the middle. I do hope it gets better adoption.