The most interesting threads, to me, (and the posters whose names will elicit an immediate click on the thread title, or the Last Post icon) are the ones where a clear, and reasonably limited premise is stated, and the issue at had is discussed, rather than the character of the proponent, or opponent of the opinions.
I don’t mind if the OP is really rather neutral on the subject, but I do think a simple statement of premise is a desirable starting position, to keep the “same old stuff” from coming up every time. “Resolved: Taxes levied on commerce are more equitable than taxes on wealth.” It eliminates the entire matter of whether taxes are good or bad, or necessary or constitutional, or any of the other often repeated tax debates.
If a new poster starts a thread like “I hate sales tax.” the available realm of discussion is a whole lot wider than “Sales taxes inhibit trade, and are self limiting.” In such a debate, it is reasonable to dismiss side arguments on the constitutionality of federal taxation as off topic, and therefore irrelevant. By limiting the scope of your premise, you concentrate on the merits of the thing you propose, or oppose, and leave associated matters to other threads.
As an excellent example, take a look at A modern symbological assessment of the ontological argument for the existence of God currently running in Great Debates.
You might find the subject matter dry, and overly academic. But it does not occur to you that it is a discussion of Fundamentalist Christian vs Pagan Animist views on deity. The thread title specifically limits the debate to a very narrow subject. You know right away that witnessing to the heathens on the Love of Christ is not germane to the discussion. In the parallel thread, Do “logical” proofs of God mean anything? the matter of individual faiths is more appropriate, although not the direct point of the OP.
So, choose your thread title, and your opening post so that you elicit the discussion you want to be a part of, not the fifteenth iteration of the same old stuff.
Tris