Honestly it feels like AI companies are still searching for the killer idea that will attract the general public (beyond "be my AI bf" or "better google").

Getting a UI that explains the parts of a bike is ok I guess, but isn't it simpler to get an actual breakdown? Google "parts of bicycle breakout" gets tons of useful images instantly.

Getting a specialized app to split a bill? It was already trivial to put in a calculator if we cared to go item by item on the bill. Having to provide names and tag every item as I go is just more work. Usually real people just go $total divide by 5, I had more, let me chip in an extra $10.

Same with booking travel and wedding plans, these aren't things people would even delegate to a trusted friend usually, much less a one-off request to an AI bot or custom UI.

Most of the useful tasks it can do right now are research, technical question/answer, coding. In terms of "build a flexible ui that solves real-world problem", if existing mobile app isn't useful in this arena, then its unlikely a completely custom UI will do the job.

That said, I've done a few small ones like a quick one to practice alphabet of a foreign language, or prototyping a web game, and the like. But ultimately its nothing that is worth trillions of dollars.