There's lots of more boring chips in phones and mundane devices that are fine on older processes; things like audio stuff and battery controllers. If you want to get away from relying on China, then those chips are the ones that are in everything from your USB hubs, keyboards, phones, washing machines - everything Less sexy, but in many ways more critical to keeping stuff going.

The trailing edge is also where Moore's law in its original sense is still going strong. The fabrication processes get cheaper and more refined over time, while this is becoming a lot harder with new leading-edge nodes.