[GrinningFool]

> on, 'Hey, doesn't the barkeeper look a little strange?', the LLM immediately seized on that and turned the barkeeper into an evil, otherworldly creature.

Though making it an evil otherwordly creature is a bit extreme, it's at least similar to what a flexible GM can do. In my DMing days, I would often develop new paths that integrated into the whole inspired by things my players noticed/suspected.

[katzenversteher]

In my GM days, I had a lot of trouble with players that tried really their best to completely leave the path I prepared for them.

You are right though and it's not that I completely dislike the LLMs "flexibilty" and openness to suggestions. However, it's also super easy to use it for "cheating". E.g. it generated a scenario with an evil entity about to attack me and some friendly NPC and I could "solve" that problem by telling the NPC "remember the device I gave you last week and told you to always keep on hand? pull the trigger now!" (that never happend, at least to the LLMs knowledge) and the LLM made up some device that shot a beam of magic light at the creature and stopped it.