Perhaps you missed the communication subtext? Once I'm certain I'm right I'm not going to talk it about it ever again. What would be the point? There's nothing left to learn. I'll have moved on to new topics where I don't yet know what is right – where I'm hopefully wrong so there is something to learn.
How would you go to right but unsure to right but sure without learning anything? I don't think that being right prevents you from learning, at least you had to learn something about other arguments so you could reject those.