I guess I'm skeptical you can steer current LLMs in this way, or at least, this hasn't been my experience.

I also worry not only about the loss of a shared experience among players, but also about the authorial voice... I find LLMs (even when prompted) tend to have an instantly recognizable style that I find unappealing.

Yes, all of this -- voice, tone, narrative direction -- could in theory be fixed with the right prompts, but I remain skeptical. From theory to practice seems such a long way...