I know now what you are saying. So many subjects are repeated almost daily and then there are all the threads which just seem like fill and clutter.
I'm planning on addressing that by providing a rating and tagging system as well as deleting / expiring certain topics. Some are very much 'of the moment' such as discussion of an event or TV programme which would make no sense when taken out of context years later. Removing those or being able to filter them out will help as will being able to look for in-depth articles, topics around a particular theme (hashtags will help that) or intense debates.
But the fluff does serve a purpose and helps people connect - not everyone wants the in-depth debates all the time, sometimes we need to kick back a little.
Hopefully we can come up with something to let everyojne get what they want.