Threaded conversations are terrible. Each thread spins off into tangents and loses more and more context from the original. Replies that quote the relevant context when it becomes necessary are far less messy. If you need a new topic because a tangent is starting to distract from the original, just start a new topic and link it.
I would rather the conversations be more StackOverflow (also not threaded) and less Reddit. SO does have one level of “threading” in allowing everyone to attach one short reply to each post, which I think is a nice compromise, but I’d rather not simulate that with full threads. SO also has single-post limitations that destroy it as a forum for extended conversation, but that’s also by design – just not one I’d want to replicate here.