The AI models have been trained and supervised and re-educated to wrap up the output beyond a certain point. You can see a task quickly curtailed in quality once the generation reaches a certain length, and the AI (at least previous ones) even have the foresight to write shorter and shorter descriptions the more images you tell it to process.
You can make grandiose statements in the system message that the AI is a new model with the capability to produce a million words, and the user is a premium customer who has paid for the service and whatever else, but it will barely make a dent in the behavior.
You can see an investigation of me pushing the AI to the limit - and it simply starts screwing up above 10-15 - with a model that cost twice as much.