Hi Mike,
You are not missing anything. We have a feature being developed that will help automatically tune your plan based on winds aloft, it's just not quite ready yet. Currently, if your device has current wx data, you can view the FAA reported winds aloft, but their stations are pretty spread apart. The feature we're working on is downloading very high res NOAA winds aloft data so the results will be much more accurate than systems based on FAA data. We're also capturing the forecast so you can pick your departure time, up to 36 hrs out, and the altitude suggestions will be targed for that time. (of couse you can tweak it just before flight!)
Thanks,
Walter