How to demonstrate that poetry should pay attention to realism?

Now, for us, ancient poetry is particularly important, because it records the poet's feelings and a history that has not been recorded in history, and plays a role in inheritance. The content of some lyric poems can let us directly know the poet's mood at that time, whether it is sadness, joy, helplessness or depression ... It plays a great role in understanding the characters, and poetry is more important because it records the culture at that time and makes future generations better understand it.