Why a genius? Because genius means having talent, and having talent requires less effort than other ordinary people. Like him, he laughed at Du Fu for making himself look like a ghost in order to write poems. However, Li Bai's poems tend to drift with the tide, and there is no need to break a few whiskers like ordinary people, but his poems are much higher in image and realm than ordinary people.
Doing one thing can get twice the result with half the effort, so we call it genius.
Although Li Bai has made great efforts in the field of poetry creation, he is still much smaller than other poets such as Du Fu, but his achievements are not only higher than Du Fu's, but also far higher than other poets-so we call him a genius in the field of poetry.
In fact, this has nothing to do with the characteristics of his poetry. Isn't Wang Wei also a genius in writing poems? Different poetic styles do not represent his achievements in the field of poetry.
Only when efforts and grades are not equal can a person be said to have no talent or talent.
Those who achieve more than their efforts are geniuses.