I undoubtedly agree that this software / platform is not the most convenient or elegant for hosting a mailinglist. The problems with it are well known. However, we explored Discourse in depth, even developing a migration script and making several attempts to migrate existing posts to it. In the end, I decided it's not the right platform. The main reason is that I cannot interface with it through e-mail. In other words, it doesn't act like a mailinglist. And since I engage with nearly every post, often using my phone, this is a showstopper for me. (See https://github.com/asciidoctor/asciidoctor/issues/1845#issuecomment-241179992)

Don't get me wrong, I still want to migrate away from Nabble. But I want to migrate to proper mailinglist software that also features a web / forum gateway. What I have in mind is using the stack that the Fedora project uses. (See https://lists.fedoraproject.org/archives/list/users@.../). Previously, we didn't have the funds to do this. But I'm happy to say that thanks to the generous contributions to our OpenCollective (https://opencollective.com/asciidoctor), now we do! So let's call it a goal for 2020 to find a new home.

I'll open an issue in asciidoctor/asciidoctor.org to discuss.

Cheers,

-Dan