What is the function of Tang poetry?

I think there are at least four practical meanings (functions):

First, it left us a valuable wealth, including cultural wealth and spiritual wealth.

Second, it provides evidence and examples for studying the history, politics, culture and economy of the Tang Dynasty.

Third, it affects modern people's behavior concepts and living standards.

Fourthly, it has made great contributions to enhancing China's international image and influence. Even contacted the flesh-and-blood relationship between compatriots in China and Taiwan Province Province.

For reference.