Is that with a dock, or without? My Pixel showed me a menu of choices for how to behave when first shown its wireless charging dock (charge to full ASAP, assume we'll need to be charged by alarm time, and some others) but I agree that a device can choose to do this from any power source, I don't feel like it gave the same choice when plugged in to a wall, maybe I'm wrong or it's in a menu somewhere.