Most vibe coding is still one app at a time. It's fine for today, but it is not the end goal.

The main benefit will happen when you can ask the AI to create hundreds of variations of your app at the same time, each optimized for a different sub-set of your users.

Picture internationalization, but instead of just translating the text on your app into different languages, the AI redesigns the whole UI to match the mindset of that culture.

This is the end of one-size-fits-all design.