Here is a provocative thought - maybe these are the so-called "better designs" from LLMs? It's not like writing English sentences is some huge secret you are sitting on that no one else knows.

Outside design systems I rarely get good CSS from LLMs.

3D type stuff too, it's useless outside boilerplate.

Very little spatial reasoning training, no end-user subjective reasoning inference (Google is starting to though even in unrelated chats), so it's no surprise the LLM doesn't know what you want.

Since I don't even know what I want half the time until I saw it, the subjective reasoning piece is key - that is, being able to predict what I'll want to pretty good accuracy. Then you have your agents etc.

as someone who doesn't know how to get better design out of LLMs, can you elaborate?

what would you ask to get a better design?