On the other hand, despite amazed by their UX thinking, I tried to use Muse and the lack of structured content (tasks, lists, connections) was a deal-breaker.
Agree. I love the vision (and their podcast) but when I tried to use it in my day to day, it fell short and got the feeling that they were focused on the wrong features for me (I.e. implementing cool and interesting features and forgetting about the boring but necessary ones).