Why do you want to add some silent letters to the traditional Mongolian language? And isn't Cyrillic Mongolian like this? What's the difference between Cyrillic Mongolian and traditional Mongolian?

Traditional Mongolian, also known as Uighur Mongolian, was rewritten from Uighur in Genghis Khan's period. It is possible that Mongolian characters with silent letters are connected by affixes and roots, and silent letters may be produced at the connecting affixes. In addition, Mongolian vowels are divided into long sounds and short sounds, and some silent letters are added to distinguish them. Cyrillic Mongolian was spelled with Russian Cyrillic letters in the first half of the 20th century (I forget the exact time). Spell the whole word directly in class, so there is no such problem as root affixes, so there are no silent letters, and the spelling of long sounds is only the combination of long vowels, so there is no case of replacing long vowels with other letters.

The above content is purely my guess, which has never been demonstrated and is for reference only. Please don't believe it.