It goes a little deeper than hierarchy and into design & tooling.
All note taking tools (try) to make it easy to get notes in but past a certain threshold, it becomes hard to find notes when you need them. It's different for different tools, 100, 1000, 10,000, but no tool really works past 10k notes.
Dendron not only makes it easy to get notes in, but help users add a consistent structure to their notes so they can continue to reference and make use of them past 10k notes.
Further details here -> https://wiki.dendron.so/notes/683740e3-70ce-4a47-a1f4-1f140e80b558.html#how-is-dendron-different-from-x-note-taking-tool