Tree based textboard

What does /prog/ think about boards like treeboard[1] and ayashii world[2]?

[1] http://tree-board.net/
[2] https://sonzaishinaiworld.heliohost.org/bbs/bbs.php?m=tree

>>10
A tree for topics is interesting, but aren't tags ultimately better?

Danbooru kind of shows off tags (including hierarchical tags)..