Rereading the thread and after having fanned out in the Community has no boundary: Discourse-as-a-Fabric - ideation & brainstorm and starting to think on Shaping Up a Business Use-Case for ActivityPub in Discourse - Discourse - SocialHub again, I realize that no one has asked to elaborate on the reasons here, which is my and other AP advocates’ oversight, I guess. Sorry about that.
Could you provide more insight in what is withholding Discourse from looking deeper into federation features, and what would be interesting areas where the ActivityPub community can provide you with more information and support?