You can try this today, it will be https://www.thebrain.com/ implemented as an outliner. I liked this idea of multiple parents so much that I created prototype of this. It’s fun to imagine how this could work, but when you’re actually working with this it’s way too constrained (because of how limited computer UIs are) to be fun. And 1) this has nothing to do with ZK, and you will soon forget about ZK when working in such software, 2) if you care about future compatibility it will only make things harder, 3) IMO there will be no Clone feature in Dynalist (too confusing for average user, too time consuming to implement properly into current feature set, too resource intensive for big documents to work without lagging when implemented in JS [remember that it must also works on mobile, where even basic Dynalist is slow]), or it will be far simpler than you would like it to see (look how basic Sort feature is, you can’t even sort by color).