I don't agree about the AI at all. AI is terrible at design (compared to programming).

Having relatively nice UI skin doesn't equal good design. They are surprisingly unrelated as i am sure people know highly usable well designed software with bad UI and also know super beautiful UIs that are unusable - badly designed.

AIs are bad at design because they don't understand and can't keep context of the whole together. Just like in programming they are much better at solving single well defined problem. Design is very much opposite of that, it's always about reharmonizing in context with the whole after you make a change.