I agree with you on the problem that makes you suggest this solution. Just this morning there is a new question on Ensolite, when there have been at least a few threads on this topic within the past week or two (not to mention months or years). Talk about reinventing the wheel for answering each new query!
On the other hand, sometimes new information comes to light
with a new query, so from that angle it can be good. One boat forum I participate in has an easy to use search function and a moderator who *always* reminds people to search first (it has become a running joke there in a friendly way).
This works out well because you get the benefit of the history (no need to repeat/re-write constantly) along with the new information (as people continually add to the thread). It's a great combination and very effective
However that is a smaller forum (I would guess half this size), so it's a bit easier for the one moderator to remind people each time they ask about something without searching beforehand. And with it being a slightly smaller group, the members are a consistent bunch and will also chime in to remind people to search first, so multiple threads don't really get going at all. Occasionally they will also merge threads to keep there from being many on the same subject.
So, I think in order for something like what you suggested to not only work, and provide old information, but to thrive/live, and include new information, moderators and regulars alike would need to be consistent in letting people know "Oh, if you are talking about bed sizes, please post in the sticky thread so we keep all the information together." But then there are multiple threads in each sticky thread, so I don't know how that would work (?) On the aforementioned website, the stickys are one single thread, not links to multiple other threads.
On the other hand, if each viewer uses search (instead of having sticky threads), then they could come up with threads on their own and add to them. But for this to work I think there have to be <strike>two</strike> three things:
1) A search process or instructions for it that people find easy to understand
2) A moderating team and regular members who consistently encourage people not to start new threads on common topics, but to instead search out the existing threads and post new content in them.
3) If there are sticky threads, that they be single, "living" threads, vs. a collection of links.
I don't know if we can or want to fulfill those two things
But, I'm really glad you brought this up, because I have found myself starting to debate (like on this morning's Ensolite thread), "Gee, do I have the time or motivation to respond to this person, when I've already said what I know about Ensolite in a half dozen other threads." I try to always chime in in such cases, but this morning I just thought "Argh, I can't type that all again today." That's nothing against that poster, because without group (or moderator) consensus on how to handle it, it's hard to know whether to jump in and request that the person search out existing information (in this case just from the past couple of days!), or what to do.
I'm very interested to see what other people think about this.