Unfortunately level design has evolved into a complex indistrial process. The earlier days from DOOM to Half-Life was a lot more fun.
There's nothing out there like there was for Counter-Strike 1.6.
I had a blast making levels and sharing them in BBS and FTP servers 1996-2002.
Imagine a game mode where you as a player can just describe what you want while the LLM builds something fun and challenging! I think in simpler games such as Doom this should be possible already.
"...we (humans) could describe ..."
Sure, it can be done. But you can already generate levels and environments generatively. How is AI going to be better at it than a person that clicks around in the Unreal editor?