Earlier quoted context omitted.
GDP is fairly easy to measure, and since a society normally consumes as much as it produces, it's a pretty good measure of average economic health. You're right that there is more nuance you'd wish to see, but it's harder to measure, and I don't know how much it's normally worth.
> it's a pretty good measure of average economic health Median economic health strikes me as far more interesting than mean. I don't really care how well rich people are doing.
ahem "people of wealth"