Why was the word "Ar-Rahman" (the Most Merciful) mentioned instead of "Ar-Rahim" (the Especially Merciful) in verses that speak of the Hereafter, such as: (And [all] voices shall humble themselves before Ar-Rahman)?

The verse (Taha/108) contains the name "Ar-Rahman," which is a magnificent name among Allah's Most Beautiful Names. It signifies vast mercy and is exclusive to Allah. "Ar-Rahman" is more encompassing than "Ar-Rahim" in conveying abundance and comprehensiveness. "Ar-Rahman" is an attribute inherent in His very essence, while "Ar-Rahim" indicates its attachment to the one who receives mercy. Therefore, "Ar-Rahman" appears in the context of the Throne and His vast mercy that encompasses all things, especially in the context of the Day of Judgment; due to the immense need of the servants for Allah's mercy on that day, where Allah reserves ninety-nine mercies with which He will have mercy on His servants on the Day of Judgment.