The main issue with novel things is that they look like random noise / trashy ideas / incomprehensible to most people.

Even if LLMs or some more advanced mechanical processes were able to generate novel ideas that are "good", people won't recognize those ideas for what they are.

You actually need a chain of progressively more "average" minds to popularize good ideas to the mainstream psyche, i.e. prototypically, the mad scientist comes up with this crazy idea, the well-respected thought leader who recognizes the potential and popularizes it to people within the niche field, the practitioners who apply and refine the idea, and lastly the popular-science efforts let the general public understand a simplified version of what it's all about.

Usually it takes decades.

You're not going to appreciate it if your LLM starts spewing mathematics not seen before on Earth. You'd think it's a glitch. The LLM is not trained to give responses that humans don't like. It's all by design.

When you folks say AI can't bring new ideas, you're right in practice, but you actually don't know what you're asking for. Not even entities with True Intelligence can give you what you think you want.