Hierarchy first means that Dendron helps you effortlessly create, manage, and reference your notes through flexible hierarchies. I call it anti-roam because instead of having every note be everywhere, every note is exactly in one well defined place (which you can change over time).
You can read about our principles here
I use Dendron to manage a corpus of 20k+ markdown notes. When I need to lookup information inside Dendron, I know I can either find it in a few seconds, or if I don't, to know for certain that it is not there. This is an incredibly empowering feeling of control in an age of information overload and it is an ability I want to give to every person in the world.