I think it's one of those things where they have to anti-exaggerate because most people really have no concept of what it means to NOT think in extremes.
For example, when a recipe tells you to SLOWLY mix in such and such ingredient, you can actually just pour it in normally. They just know that if they don't say SLOWLY, they'll have people burning down the house by triple front flip slam dunking the ingredient in.
Similarly, they say adjust until you can barely see the logo because most people are gonna say they can barely see it when it's not literally black on white.