Personally, I think parallel prose definitely does not belong to poetry. During the Northern and Southern Dynasties, although there was a literary impulse from the emperor to the common people, poetry was not so developed (the developed era was called the prosperous Tang Dynasty), and the Yongming style or Palace style produced at that time only laid the foundation for the formation and prosperity of metrical poetry in the Tang Dynasty. So I think the parallel prose you mentioned belongs to the category of articles, not to poetry.
Both parallel prose and parallel prose pay attention to the neatness of antithesis, the harmony of phonology, the gorgeous diction and the use of allusions, which are good for liberal arts. The difference is that parallel prose does not rhyme, while parallel prose must pay attention to rhyme.
If your description of me is too boring, I suggest you read Liu Xie's Wen Xin Diao Long, which is a parallel prose and should be helpful to you.
A scholar is ignorant of the world. Please forgive me for violating oral knowledge.