If you debate with me, I'll keep reasoning on the same premises and usually the difference between two humans is not in reasoning but in choice of premises.

For instance you really want here to assert that LLM are close to human, I want to assert they're not - truth is probably in between but we chose two camps. We'll then reason from these premises, reach antagonistic conclusions and slowly try to attack each other point.

An LLM cannot do that, it cannot attack your point very well, it doesn't know how to say you're wrong, because it doesn't care anyway. It just completes your sentences, so if you say "now you're wrong, change your mind" it will, which sounds far from reasoning to me, and quite unreasonable in fact.