Why do you need a scale versus just measuring cups? It’s almost entirely for the flour. When scooping flour out of a bag with a measuring cup, every person doing it (and every time you do it) will garner a scoop with a different density. The flour can get smashed down and then you get more than needed, or it can be a little too fluffy and you’ll have less than desired. In short, the cup of flour in a measuring cup is not always the same one cup of flour called for. With a scale, you’re getting exact amounts in grams. It’s just the better way to go.