I wasn't particularly clear, apologies. I was really referring to instances where navigating the tree view was a core part of the interface. This means being

I wasn't particularly clear, apologies. I was really referring to instances where navigating the tree view was a core part of the interface. This means being able to expand and collapse the tree easily, as well as identify quickly nodes that have replies. On a typical Usenet reader, new replies are normally highlighted, and read nodes/subthreads can be quickly collapsed, often by default. Neither of those are possible with HN, Reddit or typical NodeBB sites where every post is displayed whether read or not.