Why did Li Shangyin have all kinds of groundbreaking poems named Untitled?

This should be understood from three aspects:

1* The meaning expressed in the poem is confusing and may not be fully understood by the author, so the name is untitled.

2* It is not convenient to write a topic. The poet has a heavy sense of responsibility for world affairs, and he is afraid of being involved in sensitive affairs, which in turn makes people suspicious.

3* The poet doesn't want to be understood by others, but only places his feelings on it.