In both biscuit recipes, why does the author begin the instructions with "Preheat oven to 450 degrees”?

Preheating takes time, so the author tells the reader to start warming the oven before making the dough. Then, when the dough is ready, the oven is already at 450 degrees and the biscuits can bake right away. The purpose is not to warm the dough or ingredients beforehand.

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