Why did the kings of England rely on parliament in the war of the Scarlet and White roses, and the French king Louis XI

Why did the kings of England rely on parliament in the war of the Scarlet and White roses, and the French king Louis XI, in the fight against the nobility, did not convene the States General?

The states-general were an advisory body to the king. While the country was in ruin, they could not gain such strength that the barons were afraid of them, and the king spoke with them “on equal terms.” The English Parliament was formed during the struggle of the townspeople with the king and barons, so that it had an independent power.

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