[zelphirkalt]

Org mode does not "try to be an outliner", it does much more than that. It can do that in 2-3 key presses, which fold the content under each heading.

> CrossLine is an outliner with sophisticated cross-link capabilities in the tradition of the well-respected Ecco Pro.

This is the minimal description in the repository you link to. It does not contain anything, that Org mode does not bring to the table. Org more has sophisticated inter-document linking as well as citations and footnotes. All one needs to write a scientific paper in it and export to tex/latex.

What features exactly is org mode missing for you? I know you wrote, that you tested 10 years ago. Perhaps the picture has changed a lot since then.

Also I understand, that ones own tool often is like a second skin, perfectly matching, what one needs.