Poetry had in the hands of various people become a place for inconvenient knowledge insofar as it was a place for knowledge at all. But it was a place where you could talk about other kinds of experience than the official version.
Robert HassOne of the interesting things about the history of poetry in the 16th, 17th, and 18th centuries is that people who read liked getting their information in rhyme just as much as in prose. The genre that we would think of as nonfiction often was written in verse in forms like the Georgic when people thought that one of the tasks of poetry was conveying arguments and information in a pleasant way.
Robert HassAfter Pope, in the beginning of Romanticism, people developed the idea that imagination rather than reason was a special form of knowledge and its best expression is through poetry. Therefore, poetry should not try to do the stuff that mere prose does: convey information or make arguments about ideas.
Robert Hass