So with note-making, it is more of a bottom-up approach. With frames, especially with frames that can have many child and grandchild frames inside, it get closer to a top-down approach so it is easy for you to locate what you need at the moment.
With tag tree, we added one more top-down approach for you. Take the root tag tree as something like your brain structure. Whatever you want to use your consciousness (for example, in learning something, or in time management), you can go from the root tag tree and find related notes or frames that you can use.
We added one extra sorting for notes corresponding a node in the tree: sorting by relevance. With the tag tree and the algorithm of relevance sorting, we hope to help you find your past notes quickly. For details of the algorithm of relevance sorting, we will have another article to describe it.