Bots trained to play like a human are more fun, Bhuman Soni; Philip Hingston
Apparently, human like opponents were considered to be more fun. This kind of thing could be integrated easily in games, as the neural network is positively minuscule compared to an LLM.
Also there is nog chance of accidents if your npc's cant talk (well, they might shoot you, but they won't heckle you).
So I'd expect this to be integrated in real games much sooner than LLM based characters.