system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does my pizza box say preheat oven, when I can just put it in for a couple minutes longer and it's the same thing?

It also says (keep pizza frozen while preheating), what difference does that make?
gpt
Pizza companies want you to keep coming back to their pizzas, so they add foolproof instructions.  People have different ovens, so "cooking" while preheating is going to have random results, and they just can't tell people to do that if they have terrible ovens.