Damn, it may be time for me to move back to Android. Do Pixels require the updates to be sent by your carrier, or do they allow direct download?
IIRC you can download the images from Google via web browser and flash manually, but not sure if you can still do that, and I've never tried it myself.
Yes you can still can. https://developers.google.com/android/ota#cheetah
In fact they even host all the images dating back to the Nexus lines still.