They might sound like the same thing, but there's a big, important difference between body weight and body fat, and one issue with the scale is that it doesn't distinguish between the 2.

Body weight = how much you weigh based off the number on the scale (impacted by LOADS of other things).

Body fat = the percentage of your body weight that is made up of fat.

If your goals fat loss, yes you want both your weight and bf% to come down, but it's really important to understand the difference between the 2 especially if you're going to use the scale.