This is because AI-generated code will always be mediocre. There is so much poor-quality code in the training base that it will dilute the high-quality sources. AI is not a craftsman who builds on his own high standards, but rather a token grinder tool calibrated to your prompts. Even if you describe your problem (prompt) to a high standard, there is no way it can deliver a solution of the same standard. This will be true in 2025 as it was in 2023 and probably always will be.