I would rather have a thread die if there is no more interest than read through relies that have nothing to do with the OP.
The way I see it, as an on-off mod of a couple different forums, is: chatter is the connective tissue that keeps the constituent components of a community lively and attentive and engaged. There are certainly times and places where it's inappropriate, but I've seen communities absolutely try to clamp down on it, and 1) it doesn't really work, and 2) it dampens the community as a whole as a side-effect. It's an organic thing that happens where it happens, and trying to make it happen somewhere else doesn't really work. Having to scroll through a dozen off-topic posts isn't all that onerous, in exchange for keeping a body of posters hanging around (and providing genuinely-useful advice and commentary as a by-product),and the community highlighting actual good and on-topic posts with upvotes and the like is a convenient countermeasure to aid those who'd rather skim.
The thing where the OP can identify a particular post as a Topic Solution is also excellent for condensing a technically-concerned post down to the essential responses, but it doesn't seem to be enabled on many subforums here. I think expanding that to more of the equipment-minded subfora where a lot of technical discussion is going on would be helpful, but hey, not my ship, not my helm.