Andrea Zanni likes to try Discourse as an alternative to a mailing list, see her post to wikisource-l https://lists.wikimedia.org/pipermail/wikisource-l/2016-January/002678.html. We'll see who like to try.
The discussion on the mailing list had serious objections, especially regarding archives.
This site is a pilot to test, to figure out settings. Having access to archives is a normal request. You can download your posts from https://discourse.wmflabs.org/users/jayvdb/activity. The possibility to export and download all posts by all users is under development, see https://meta.discourse.org/t/ui-topic-and-category-export-import/39247/1.
Have a nice day,