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Why was the capture of King John II at the Battle of Poitiers important?

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Medieval illustration of the Battle of Crecy shows armored soldiers fighting with swords, shields, and bows as mounted knights and banners fill the background. — Hundred Years’ War Image depicting the Battle of Crécy, during the Hundred Years' War, in which Edward III of England defeated Philip VI of France on August 26, 1346.

The capture of John II at the Battle of Poitiers in 1356 was a pivotal event that plunged France into a period of severe political and social instability. His imprisonment had several critical consequences:12

Political Crisis and Regency: With the king in English captivity, his son, the dauphin Charles, assumed the regency. His authority was immediately challenged by the Estates-General, which demanded administrative reforms in exchange for funding the king's massive ransom.13
Internal Unrest: The power vacuum and the financial burden of the ransom fueled domestic turmoil, including the radicalization of Étienne Marcel in Paris and the violent peasant uprising known as the Jacquerie.13
Treaty of Brétigny: The king’s status as a prisoner forced France to negotiate from a position of extreme weakness. This ultimately led to the Treaty of Brétigny (1360), which required a ransom of 3,000,000 gold crowns and the cession of significant French territories, including Aquitaine, to English sovereignty.134