If I can't have fun still when I remove all the fluff and pomp of narratives, your game doesn't have great gameplay, if any at all.
Like I said, I don't need to gamify writing. Writing is already fun, gamifying it is restrictive.
If its all drama then nothing is dramatic.
Sharp line no, but there is a line, and that line makes up the difference between a cohesive experience and an incoherent one.
I would even go as far as to say its the same fundamental problem I noted previously about integrating mechanics.
The key value of all games as an artistic medium is that they leverage interactivity in a way other mediums can't to reach the evocations the work is aiming for.
Now, Roleplay is interactive, no doubt, but it isn't mechanical and fundamentally can't be when you get down to it (hence why social mechanics always tend to fail), and without mechanics, you're not actually creating a game. At best, you'll only ever have a book of prompts, which is fine if you're honest about what it is, which isn't a game.
And when you do have mechanics, they need to be integrated in such a way that they follow through on what the game is trying to do.
PBTA type games may be following that if we take their goal as just being drama generators, but Drama doesn't inherently make for a good story, and definitely not in the way that these games create it.
I think Sid Meiers philosophy on games (a series of interesting choices) also applies here. Theres not much interesting choice being fostered when the "Drama" being generated is not a consequence of choices but just a hamfisted requirement of interacting with the game.
Edit: this also relates to earlier opinion of mine that people are way too obssessed with and try way too hard to tell stories, while neglecting the value of the game as a medium to do so.
Mechanics can generate stories all on their own, without needing to force and hamfist the narrative.
So in that light, I would judge Story First/Story Now type stuff as being a fundamental misuse of the medium, which yet again loops back to my comments on innovation and how mechanics are being held back. Better mechanics will do more for a game to tell stories than trying to force it will.