I know what you mean.
It is the argument of the ostrich.
I’m not sure I know what you mean, but what I mean is that it’s one thing to state your position “in a vacuum” or on FR, but it’s something else to engage with people in real life. In real life, you start at whatever point you’re given, and you argue to the point where the interlocutor disengages, and you hope you or someone else gets another chance at them.