I expect that this could range over all the UX features we find 'out there' in, for instance, Logseq, Obsidian, Mastadon, Slack, IdeaLoom, SenseCraft, and so forth.
This quest is about collecting worldviews on this subject, and justifications for those views.
It is part of the left-hand side of Theory U; it is not abut designing any specific artifacts. That could happen in various quests which spin out of this conversation.