Interesting perception. Readers here discuss hierarchies all the time – it’s a basic idea. FWIW, the concepts of “importing markdown”, “exploding notes”, and “hierarchy” while not mutually exclusive, are also not the same thing.
I don’t know that this solves your need, @Luctaesch, but there’s another direction you might explore. Tinderbox has a very basic interpretation of hierarchy (parent/child relationship) for data pasted into an outlines: tabs represent levels. The images below show what happens when an “outline” of sources created in TextEdit, with one, two or three tab indents, is copied and then pasted into Tinderbox 7 (second image).
The original in TextEdit
The result of copy then paste into Tinderbox 7
The first note, imported outline, is created automatically and indicates Tinderbox is sensing an outline on the clipboard. The outline is placed inside this parent so that the pasting action does not inadvertently cause issues in your document. There is a limitation: Tinderbox cannot sense in a pasted outline the difference between $Name and $Text.