Every single "design tool" I've seen with LLMs right now looks good at VERY SPECIFIC things. Push it just a tiny bit outside of it's bounds and it looses the plot. Every single time. This is still valuable, sure, but only at the low level tedious work.
I'm not a luddite! These tools are going to be capable, but mostly at taking routine tasks (e.g. layout in a known space) and making it super fast.
2/3