I agree but it makes me wonder how we will know we went into power saving mode. I would assume the watch gives us one last emergency warning that it is going into power saving time only mode. At that time I would start watching the phone for notifications again.
This is what I'm hoping for too. That it will be obvious, somehow, that the watch is in power saving mode. I too love the idea the phone will be silent and that all notifications will go to the watch...thus my concern that the watch notifications need to be "trustworthy".