Comment by GuB-42

And yet, that's exactly what computer RPGs are all about, one of the most popular video game genre is essentially about automating dungeon masters. It includes early games like Colossal Cave Adventure and Zork, which are chatbots not unlike a very primitive version of ChatGPT.

If you have a good role playing group, with a DM you enjoy playing with, no computer game nor LLM will replace that. But if what you are looking for is the convenience of computer games with the freedom of tabletop RPGs more than the social aspect, then LLMs totally make sense. And even with a social group, it can work as substitute if you don't have a DM (DMing is hard work!).