Why did ancient landscape poems appear so late?

Because the country was in turmoil, the people were displaced, and the crisis in the Tang Dynasty deepened further, so in the late Tang Dynasty, Tang poetry showed a declining trend, which was unsustainable after the development of the prosperous Tang Dynasty and the middle Tang Dynasty.

Probably in the late Tang Dynasty in the history of literature, it took about 70 years from the Yamato period in Tang Wenzong to the end of the Tang Dynasty. At this time, the national situation is getting worse every day, and the life of scholars is also very mediocre. With the changes of the times, poetry creation has undergone obvious changes and entered a new stage.

In the late Tang Dynasty, there was a decadent trend. During this period, the creativity and realm of poetry created by poets became narrower and more bitter, but with it, the feelings of poetry began to become more delicate.