Yes, exactly.
Edit to respond to your edit -- not to split hairs, but I don't think ENTP is sincere about what it is saying in every case; in fact, with all respect, I think the opposite. I think ENTP argues because it needs pushback. The substance of the argument is often lacking, as Peguy points out. But the argument is most often not for the purpose of finding truth, it's for the purpose of making contact. Once the rest of us understand that, it makes it easier to get up and go a few rounds with you.
Ah, I'd refer to you to my lego staircase analogy if I could remember which thread I wrote it in all that time ago.
Basic jist is this: suppose we're both standing on the ground, and above us is a floating platform. You tell me that your car has broken down and you haven't the money or expertise to fix it. I know (cos I've seen it) that on that platform there's a mechanic's workshop, where a dude takes people and their cars in and teaches them how to fix it themselves, walking them through the process, and he does it all for just voluntary donations.
I tell you this, but you don't believe me, cos you've never seen or heard of anything like it. But I
know it's there and that if you can just take the leap and get up there, you'll see and you'll be alright, your problem will be solved.
So I've got to convince you somehow to get up there, and make a way for you to do it. I'm gonna build a staircase up to that platform for you, but it's got to be a staircase you like and will climb, so I've gotta build it out of bricks that you'll like. It doesn't matter what I think of the staircase or the colours and shapes of the bricks it's built of - what matters is that YOU will climb it and just get to what's at the top.
So, that's an analogy I reckon, for a lot of what you think are the insincere parts of the ENTP's argument. It's the "humour me - just suppose...." part. The part where I'm finding out what bricks I can use to build a staircase to my point, one that you'll climb, so you'll see my point when you get to the top of it. More than one way to skin a cat.
So to say 'insincere' is perhaps not quite it. Cos I'm sincerely engaged in trying to get your mind to a place where mine is, because of something I sincerely believe in, that I sincerely want you to know or understand. Because I can't tell you to take the same path I did, because I did it
intuitively 