How did Allah swt reveal a perfect Qur'an using an imperfect language?

The content of the Qur'an can be summarised as explaining humanity's great unknowns (ghayb) - purpose in life and how best to fulfil this purpose. It helps contextualise this by explaining what preceded the universe, the eternality of God, the gathering of the souls, the primordial covenant, origins of humanity via Adam and Eve, and what will follow it, the eternality of God, and heaven or hell. The contents are often divided into three categories: moral, legal and ethical matters; metaphysical matters including prophecies of future events; and religious, cultural and historical references of previous and contemporary nations. Source How would you describe the content of the Quran?

Ibn Khaldun said in his al-Muqaddimah that the Arabic Language was perfected by the Quran. in addition, the Quran is a master work of literature. Furthermore, Allah (swt) created the languages, the humans did not. Hence, the argument that human imperfection could affect it non ill-founded. Moreover, even if it were so, Allah has promised to protect the Quran and the Deen, so there is no cause for worry.