No, you're right, there's a lot of information in there... and that one component is no less than any other component.
I was disappointed, because I guess I was looking for a fuller ppicture. I wanted to know all of the places where most of my lineage is from. I'll probably get over it eventually, and see the value in this someday. But I was clearly extremely naive about the science of this test before I explored, and I guess I just got a little too big of an idea as to what it was really capable of.
Supposedly, there are also tests that supposedly determine what percentage you are of what. But aparently even that's limited, because it can only tell you what percent African, vs. European, vs. Native American, without being able to tell you which parts of Africa, and which relatives they trace there. Also, there is doubt as to the validity of them.
At least we can take heart that if science can somehow continue to advance, someday a more complete picture will become available...