Just like when we want to create "a perfect" novel game, it will be far more effective if we use a tool that can help us achieving it instead of solely relying on our brains that already have so many problems in life.
Are you saying that, in more than two millennium, no one yet was able to write a single good story ?
When it come to arts, and writing is an art, tools can only provide you with raw materials. Then you'll have to polish it, slowly and manually.
When its applied to writing, polishing it will need more times and energy than doing everything by yourself. This mostly because the story not being yours. Therefore, you'll not have the ins and outs in mind, constantly looking back at was already be wrote, to ensure that it's still coherent.
And constancy will not be your only problem. Make just one wrong assumption regarding the direction followed by the AI, and you're doomed. When you'll notice that it and you aren't following the same journey, either you'll have to rewrite a big part of the already polished content, or you'll just have to discard whatever the AI provide you in the future.
But this isn't even the biggest issue you'll have. As I said, AI can be good, but only when it come to raw material, therefore something static that will lack of meaning and depth. An advanced AI can probably write the
Lord of the Rings, but it will be a 100 pages story. All the substance of Tolkien's writing will be absent. All the emotions carried through the story, it will be your duty to put them back.
While this kind of story can still be enough for a movie pitch, because the actors will provide what is missing, it would only lead to something average for a book. As for a game, what is the topic here, it's just a big no. A game is something dynamic, the narration should be limited to the strict minimum, everything relying on the action, whatever through the visual, or through the dialogs. Therefore, it's the exact opposite of what an AI can provide you.
Worse, to be meaningful, dialogs need to carry the characters' emotions, and it's where AI are the worse. Since they can't understand emotions, they also are totally unable to transcribe them correctly.
"I'm your mother, so, no, we will never do this."
"Asking me this, are you crazy ? I'm your mother !"
"Honey, we can't do this... I'm your mother..."
"Not now. Remember, I'm your mother."
In both case, the mother refuse to do something incestuous with her son, precisely because it's incestuous. But each one of those example carry a really different message.
The first example use a neutral tone. We can expect the son to be young, or at least to have made a small demand ; a french kiss, seeing her nude, or something like that. He don't know that what he want is wrong, or don't feel it as wrong as it is, and the mother react accordingly.
In the second example, the mother is angry. The son is past his half teen ages, and asked for something explicitly sexual, what clearly offended her.
For the third example, whatever the son was asking, he clearly isn't the only one to have incestuous thoughts. The mother is ready to give up to her own lust, a small push from the son and she'll be his.
As for the last example, the mother is already in an incestuous relationship with her son. The problem is not what he asked, but the moment he asked it ; he can't french kiss is mother during the usual family dinner at Christmas by example.
What an AI will give you is a generic sentence expressing the refuse, and possibly including the reason. It will then be your job to make it fit the full context. And, as I said, this will need more times and energy than writing the dialog by yourself.
When you write, you're in front of your keyboard, but your mind is in the center of the action. You are living it, and it's how the words come, how the sentences add together. You are witnessing the scene, and you just report what you see, what you hear. Then, when you'll go back to your works, to correct him, giving it it's last polish touch, it will be like those times where you think about something that happened in your past, and you wonder if saying "this" wouldn't have been better.
But if you rely on an AI for the draft, it become something else. You'll not write about what you see. The witness will be a third person, and you'll base all your works on his transcription of the action. It's not something impossible to do, but it's the job of a script doctor, and it's an art even more difficult than writing ; yet, a script doctor have something that you'll not have, he can ask precision to the author...
There's nothing wrong with using a tool to help us in our writing process to make better improvements to our games
There's nothing wrong, yes, but only when it effectively improve something, what isn't the case here.
To use your own example, you're going for a 100km trip, using a plane in place of a car. Therefore you'll have to travel for 30km in order to take your plane, do 150km with the plane, then travel 20km to reach your destination. It will neither be faster, nor more efficient.