Yes I get it too, if that's the info you want, it's a strait forward way to get it. That being said, when I fly casually, it's rarely on a single bearing. The first thing I'm going to want to know,,, is it prudent to fly at all. If my plan is to remain upwind, I just want to know which half of the compass I need to be on when I get close to Bingo.Fair enough - you make a good point. If you are going to stick to a specific heading out and then back, then your method does give a more direct and simple measure of the ground speeds that you can expect.
I am more accustomed to knowing the actual wind speed and direction but the calculation to get the ground speed values on a particular track, out and back, are more complicated to calculate and don't actually have a simple closed-form solution.