The true Qirāʾāt tradition preserved and controlled only one linguistic recitation against the seven ahruf or distinct authentic modes or variations of reciting the Quran.
It is impossible to make a claim that Allah revealed to the prophet the Qur’an in 7 ahruf to facilitate recitation for different Arab tribes.
The prophet received his revelation in his heart and he can only recite it in his own Quraish dialect and none others –
S2:97 Say: Whoever is an enemy to Gabriel-for he brings down the revelation to thy heart by Allah’s will, a confirmation of what went before, and guidance and glad tidings for those who believe.
There is only one recitation by the prophet and it is in the dialect of the Arab Quraish (S106). This is one and only that millions of Muslims memorised by hearts from the time of the prophet until today.
S29:49 Rather, the Qur’an is distinct verses preserved within the breasts of those who have been given knowledge. And none reject Our verses except the wrongdoers.
MEMORISING OF THE QUR’AN HAS BEEN INSTITUTIONALISED
The memorised and the written Qur’an have been the same from the time of the prophet until today…..
Individuals who have memorized the entire Quran are known as a Hafiz (male) or Hafiza (female), and are recognized in Muslim countries through a combination of formal examination processes, community acknowledgment, and the granting of certifications.
Oral Examinations: The primary method of verification is a rigorous oral examination. The individual must recite the entire Quran (all 114 surahs and 6,236 verses) from memory to a qualified teacher or a panel of scholars, without the aid of a physical copy (mushaf).
Accurate Recitation (Tajweed): The recitation must adhere to the strict rules of Tajweed, which govern the correct pronunciation, intonation, and articulation of each word and letter of the Quran.
Certification (Ijazah): Upon successfully passing the examination, the individual is awarded a certificate, often called an Ijazah. This formal authorization validates their mastery and grants them permission to teach the Quran to others. The Ijazah often includes a Sanad, an unbroken chain of narration tracing the transmission of the Quran back to the Prophet Muhammad (PBUH), which holds immense spiritual and academic value.
Institutions (Madrasas/Hifz Schools): Many individuals achieve this through structured programs at Islamic educational institutions (madrasas) or specialized Hifz schools, which have a formal curriculum and assessment procedures, culminating in a final exam and a diploma or certificate.
With this kind of institutionalisation the memorization of the Qur’an how can there be many or diverse ways to read the same Qur’an unless there is fabrication.
S13:37 Thus have We revealed it to be a judgment of authority in Arabic. Wert thou to follow their vain desires after the knowledge which hath reached thee, then wouldst thou find neither protector nor defender against Allah.
S39:28 A Qur’an in Arabic, without any crookedness therein: in order that they may guard against Evil.
Pondering with Saifuddin's index 