It can be deeply enjoyable to argue with people who share a common philosophical perspective, because these differences of opinion emphasize a commonality of understanding. This is as true of an argument about sports as it is an argument about what an argument is.
I believe the pleasure in this activity is similar to enjoyment of art and of religion at its best: something shared that is undeniably real but which defies speech becomes palpably present. This presence connects us.
No matter how rarefied our stratum of thought, discussing matters of truth within this stratum happens within yet another stratum of commonality, and it allows us to feel its reality and our connection within it.
Even if we try to transcend our understanding, to suffer and grope for a passage beyond our knowing, we do so within something, and we do so with others who feel the presence of tacit commonality — a commonality of restless souls who keep feeling their way further and further, in thinner and thinner air, with fewer friends.
What we love for no reason we can explain, we love for lack of words.