Is it permissible to recite the entire Qur’an without hamzah, based on the language of Quraish, who did not use hamzah, even if this contradicts the well-known recitations that are not devoid of hamzah?

It is not permissible to recite the Holy Quran without the hamza, nor is it permissible to recite it without a transmitted narration. Recitation is a sunnah that must be followed and accepted. The letters of the Quran are not to be treated according to what is most common in the language or most analogous in Arabic grammar, but rather according to what is most established in transmission and most authentic in narration. Scholars have explicitly stated the prohibition of reciting in a manner that conforms to the language and script but has not been transmitted, and whoever commits this is committing a grave major sin. It is not correct to assert definitively that the omission of the hamza was universally the language of Quraysh, for Quraysh would lighten the hamza by substitution or facilitation, but they did not omit it entirely. Al-Suyuti weakened the narrations about the Prophet (peace be upon him) and the caliphs omitting the hamza due to the weakness of their transmitters.