>>17Tags are useful. I use it to clear my exhentai feed from vile shit. But even then unwanted stuff pops up.
One could keep the tree structure but use tags to enhance it. If one has marked the tag optimization and there's a topic in all-technology-programming-win32-graphics the tree could light up.
But this just makes the data part even harder. You'd have to gather an army of autists tagging everything correctly. Once it becomes unreliable people will stop using the feature.
Maybe somethings like
http://hydrusnetwork.github.io/hydrus/ gets implemented in finder/explorer and people become more familiar with tagging.
Honestly this is just a headache. It get annoyed just by the idea of having to tag my shit. Most elite knowledge from elite prog rammers just gets dumped on a mailing list, irc, discord, twitter or whatever, completely untagged and uncategorized. People are lazy.
The biggest working example of tagging in a forum would be stackoverflow but only the popular posts get tagged properly and tagging is a huge overhead and reason for debate.
I don't even think it's something people want. Pretty sure prog would die if all posts were about programming.