I think if such practices became mainstream, then people would begin to realize the difficulties involved in having a coherent conversation about a point of disagreement. The passive-aggressive cudgels you mention would fall flat because it is instantly noticeable as not fitting the necessary patterns for coherent conversation.
No one needs to accept or reject the other. the point of an argument is to educate each other, answer questions, and allow each other to fit both opinions into their own world view (ex. what are the limits / specifics to your belief?). Maybe someone changes their mind during that conversation, maybe they dont. maybe someone needs to let the new information ferment in their minds and life for a bit before it clicks. that is part of giving someone benefit of the doubt
maybe you are talking to someone who is venting, or in the middle of a mental episode (i mean that literally, not derogatorily), or was unfortunately born a narcissistic manipulator and cant help themselves. It doesnt matter, they cannot "win" the conversation - no one can - and the more people that realize this truth about conversations in general, the better the world will become