A key feature that he tries to accomplish is composability through linking, a la sys/Zettelkasten. This method of composability partially relies on effective compression of ideas into relatively atomic notes about key ideas, that he can then densely link with others. This partially achieves [[contextualizability]] as well.
Encountering a novel problem activates some chunks from past experiences. Not all of them will be helpful; and some will be actively unhelpful. And some will need to be decomposed (compression reversed??)
Built on top of sys/TiddlyWiki, and inspired by Andy Matuschak's approach, she also employs compression to enable richer [[contextualizability]] through bi-directional links. This particular instance, though, has less connection to primary/original sources, which is fairly typical of many of the Digital Gardens at play right now.
This might be one reason that Andy Matuschak and Michael Nielsen think that Z: The most transformative insights must come from a single "mind". Because it's really challenging to (or we haven't yet figured out how to) enable a medium with data model properties of compression, context, and compositionality that spans multiple minds; a distributed system that enfolds or spans more than one mind and their workflow.