Here, I hope Google takes a lesson from their wearable platform. Widgets on WearOS are designed to be extremely battery efficient namely by taking away responsibility from the applications. Instead, apps more declaratively hand over display information and leave the real work to the OS, its position much better suited to managing the overall system characteristics.
With that said, widgets on Wear aren’t entirely a success story. Many of them don’t work properly. But, I think there’s still a lesson there.