[NTH]

AI.JSX (https://github.com/fixie-ai/ai-jsx) is a framework specific to AI App development, but it's built to integrate with React / JS UI development.

So I think the answer to your question is "both". :) To build an AI app, you need many of the same skills you need to build any other type of app. But it's not like AI is some spooky thing that only ML pros can touch. It's accessible to any dev.