2. The relatively developed Han Fu in Han Dynasty squeezed the development of poetry.
3. Personally, I think poetry belongs to folk songs and belongs to the jurisdiction of Yuefu government. In other words, if it is sung by inexperienced musicians, it is not elegant.
4. Take nineteen ancient poems as an example. Most of the authors are frustrated literati who have reached a quite mature stage in art, so they are widely circulated among the people. However, Han officials did not admit it. So it can't be widely circulated.
In addition, the number of scholars, immature means of communication, printing and papermaking also limit the development of poetry.