I have one question:
Why was hinduism scripture written in poetry format rather than descriptive text?
Hindu Scriptures are written in poetry format, because they can explain a lot more in fewer words. Narrating the same in descriptive text format would make the narration too lengthy and cumbersome.
However, there are instances of scriptures written in descriptive text form.
The entire Canto V of Srimad Bhagavat Mahapurana is narrated in text format and not poetry except for some prayers.