Why do many compositions require "unlimited style" in addition to "poetry"?

Poetry, as an art, cannot be called composition in theory. Because there are many kinds of poems, many poems are difficult to understand, which is a problem for critics. He can't translate sentence by sentence, it will be very complicated. Therefore, it belongs to the scope of poetry style, but according to the situation of college entrance examination in recent years, there are also some poems that can get full marks as compositions. The key depends on your ability. If you think I speak well, take it. )