We have more common sense than magazines think

I was flipping through an old issue of All You magazine and found a recipe for side-dish potatoes that I thought I might try.

I had to love the "kitchen tips" that went along with the recipe, though.

Work in advance. You can make the potatoes through step 2 up to a day ahead (don't preheat the oven). Cover and refrigerate the potatoes. The day of the party, pipe and bake the potatoes, allowing an extra 5 minutes of baking time.

Did they honestly think that they had to warn someone not to preheat the oven if you were preparing this recipe ahead of time? How clueless do they think their readers are?

I can't decide if I should be insulted, or if I should laugh at how clueless the recipe editor was.