The UI is the layer the customer is most likely to interact with and request changes over. This is why using the AI as the intermediary is so compelling. Most UI code is not long for this world if we are actually putting it in front of live customers. The less emotionally & economically attached to it we are, the better it is for everyone involved.

When my customer gives me crap about the UI, I barely even process it as a cortisol event because I spent very little time inventing the thing they are concerned with. It makes iterating faster and easier when you don't have much pride on the line.