Dear it makes me happpy to see your understanding of the concept of GDP. But take the Nobel Prize winners of any decade at random and 4-5 will be on the topic GDP.
There are different measures of development, social indicators, economic indicators, HDI etc. but follow to analogy; If you want to tell someone how wealthy or well off a family is you can say;
1. How many houses and cars they have,
2. How well educated the family is,
3. The kind of jobs they are doing,
4. The kind of awards and respect this family has earned,
5. And the collective earning of all the members of the family. [which in case of a county makes up GDP, which can again be different for different people, as not all the brothers in the family will be earning same amount of money].
And no offense taken.