> A background watcher reads the foreground app's identifier once per second; when it changes, the overlay you authored for that app is layered on top of the device's global bindings, with per-app entries winning and any unlisted button falling through to the global map.
as is in the documentation right now could have just read
> Your device will automatically use app-specific keybinds when a given app is in focus.
So much of the documentation copy especially is typical of the ways LLMs leak implementation instructions into their written copy.