One use case in production i might see for this:

1. Using callbacks as commonly done in javascript, might offer a very easy to use way to write low power code(because the chip can automatically sleep between callbacks). This is nice versus today's high complexity low power design.

2. The author used regular mcu for this board. But low-power mcu needs orders of magnitude less power. And of course low-power pcb design can save even more.

Combining the 2 together, maybe we can see a good enough option for building 1st version, low-power products(say kickstarter guys) where they can spend a bit more on chips and there's less competition on specs - but things like low cost of development, time to market, and high domain knowledge with less technical knowledge are important qualities.