Easter dinner is early. Church runs until 11, maybe later. The ham needs two hours, the scalloped potatoes need an hour, and someone promised deviled eggs that still need to be made. A midday serve time with a compressed morning means there's no margin to figure it out on the fly. Set when you eat, and the morning sequences itself.
Thanksgiving gives you the whole morning. Easter doesn't. Between church, getting the family dressed, and a serve time that's closer to lunch than dinner, you're working with a shorter runway. The ham still takes two hours. The sides still need oven time. And anything that slips pushes the whole meal past the window when people actually want to eat.
Ready Time works backward from your serve time. If you're eating at 1 PM, it tells you the ham goes in at 10, the potatoes at 11:30, and the glaze goes on at 12:15. You get the sequence and the start times before the morning even begins. Follow the notifications through a compressed morning and everything lands together instead of one dish at a time.