Because 'quality' is a misnomer. LLM writing has quality in the same way that a press release from a big company has quality, or a professional contract written by a lawyer has quality. It is functional, generally typo-free and conforms to most standards but that doesn't mean it has flavor or spice to it.

Creative writing is the intent to convey feelings, thoughts, to create atmosphere. Here's a great example of the failure to do so here, in a way that even most terrible writers would avoid.

> “It just said harvest,” she told Tom. She was sitting in one of the plastic chairs, holding a cup of the adequate coffee.

The coffee in this story is conveyed as being 'perfectly adequate'. But how do you convey adequacy? When you simply just say 'the coffee is adequate' there's nothing there. It could be conveyed by establishing that the coffee is always perfectly room temperature, or with the mere hint of bitterness and sweetness, or that it tastes like every other brand out there. In many respects this story is the exact same as the 'perfectly adequate' coffee: functional, unexciting and ultimately flavorless.