Yeah, the conversation's fine with me. Maybe I'll sum up my position here.
Two things. Thing 1 is the medium of play. This is in-character conversations, rat-zombies, sewers, characters, characters' girlfriends, Elliot's guy's handgun and my guy's background as a librarian-wizard. Thing 2 is story. This is loyalty, passion, jealousy, ego, then conflict across moral lines, escalation, crisis, and resolution.
1 can exist perfectly happily without 2. Up at the top of the thread is an example of lots of 1 with no 2 at all.
The Big Model doesn't draw distinctions at the level of 1, but at the level of 2. (The Big Model calls 1 "exploration," and puts it at the foundation of all play.) GNS says: does your game have passionate characters escalating conflicts to resolution, or doesn't it? Are your game's players live and active collaborators through the process of play, or is something else going on?
I think that you're looking for 2 to be the basis of 1's value, in all cases. I think that your objection to GNS is based on this. I think that in fact, no, 2 is the basis of 1's value in some cases, but not at all in others.
I can talk about the value of 1 to Step On Up play, and the value of 2 to Step On Up play. (In fact that's my favorite thing about Storming the Wizard's Tower.) but if your position is that Step On Up play is, in fact, Story Now play, we really have to sort that out first.