No Dave, you're correct. Ceramic cookers work as a smoker, oven and grill, all in one. My Primo XL will hold solid temps from 180-800+ degs.
To be honest, I thought that all the reverse-sear hype was just that, and simply a convenient way for folks using ceramic grills to grill their meat without having to wait on their oven, I mean grill, to preheat. I was wrong, though. Dead wrong.