Those of us who were here before the forum software change have already discussed this. The old forum was a standard phpBB forum, where everything was indeed split into subforums. The problem is that we weren't even using half of those subforums, and the ones we weren't using hadn't received useful (non-spam) posts in years.
I suggested a *booru-style tagging system to make it easier to find threads, and I recall there being some support for the idea, but it just didn't happen. At any rate, Ville is focusing on Driftmoon right now, so forum software upgrades will have to wait until later. (I forget when exactly.)
The problem we had immediately after the software change is people posting threads that describe their problem but not with which game they're having the problem (Like this one or this other one), but even that seems to have subsided. Just title your threads right and there should be no practical problems with the new forum.
I for one have no problem with this forum. Only the top ten-ish threads are active at any given time, so it saves a few clicks to see them all at a glance if you just want to check for new posts. If you need to find an older thread, there's always the search box.
Edited 6 years ago