The expediency of Surah Al-Fatihah as the first Surah linked to the Qur'an is to establish him as a great religious figure, which heightens his grandeur.
We can arrive at this answer because:
In this case, it is very convenient for Surah Al-Fatihah to be the first Surah connected to the Quran because it optimizes his place as a leader and a respected figure.
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