Us "cake people" perfect a recipe (with or without "pre-measured ingredients), develop a filling, perfect an icing, and then decorate our hearts out. Whew! (Not to mention the actual baking and cleaning). Pre-measured flour and sugar is such a tiny part of our job, that I refuse to "guilt" for it. But like it is said her so many times, "People" just don't get it.....
I have ZERO guilt for boxes--- those companies do NOTHING but perfect their "pre-measured" ingredients- and I take advantage of it! I am not too lazy to measure sugar, flour, powder, and salt--- I just can't get it perfect EVERY time like a box can.
If it concerns you, unpack in the car, and never bring those boxes in the kitchen.....
I don't grind my own cinnamon, grow my own strawberries, or churn my own butter--- but I use boxes, and I consider myself a scratch baker.

Just how far do you need to go, to be "scratch"? I don't use the "side of the box" added ingredients, and THAT makes it MINE.

))