This is the direct advantage of knowing your weights. Fly changes become more deliberate and less experimental. Efficiency improves, as does your confidence to read water and the ability to fish it well.
Knowing your weights and measures is about understanding how to balance the elements of your fishing rig. It’s a give and take. But it’s up to you to first know what is being balanced. It’s the design of the leader, the weight of the flies, material resistance and distance. Put numbers to these things, and know your stats . . .