Earlier quoted context omitted.
I should take a look at that, in case there are features there that org-mode doesn't already have and are worth stealing. More seriously, that looks like at least a sizable subset of org-mode's capabilities, implemented in a way that doesn't require clearing the hurdle that getting comfortable with Emacs tends to be. How is it on the import/export/interop side?
Never mind Emacs, Emacs is easy. Org-mode itself seems like a tool where you have to read fifty pages of documentation to make good use of it. Maybe I'm exaggerating, but I've tried it a couple of times, and it never seems to be worth the complexity penalty vs. using a plain text file.
Without having to read anything you just have to remember to use * to mark sections and * * for subsections and so on. Then you use tab to expand/collapse the sections. That's rather intuitive, not more complicated than a plain text file and already you have better highlighting and additional functionality.
Then sometimes I wonder "hey, I'd like to have a link to this URL in this file" or "I'd like to export this to HTML or PDF so that I can send it to my friend who doesn't use org-mode without losing the formatting". And then you look in the manual and you (generally) find what you're looking for.
Sure if you want to be an org-mode wizard you'll have to learn quite a bit but I really don't see "the complexity penalty vs. using a plain text file". The complexity is only here if you want it.
Edit: also the array auto-formatting is a godsend. Doing it by hand in text files is tedious.