The reason for the dislike of omitting the surah after al-Fatihah without omitting the opening supplication

Question:
Honorable Shaykh, may Allah grant you success, why do we say that it is disliked for him to omit reciting a surah after al-Fatihah? And why did we not say that it is also disliked for him to omit the opening supplication or other recommended practices, even though all of them are recommended?

Answer:
Because the Prophet (peace and blessings be upon him) recited aloud after al-Fatihah. Allah (Mighty and Majestic) says: Reciting the Qur'an is not the opening supplication; reciting the Qur'an is the speech of Allah (Glorified and Exalted is He), so it is recited. As for the opening supplication, this is a supplication; this is a recommended supplication. If he performs it, it is better, and if he does not perform it, his prayer is valid.