[Aidevah]

The survival rate for certain 15th/16th codices in Western Europe aren't great either. From England there are only three choirbooks (Eton, Lambeth, Caius) surviving from the first half of the 16th century, when the catalogue from just a single college at one university lists tens of choirbooks. Given the sheer number of cathedrals, colleges etc which supported musical institutions in pre-reformation England, the scale of the loss becomes apparent. Similarly there is almost a complete loss of all musical manuscripts from the royal court of France, such that the compositions of the leader of its court chapel need to be recovered (incompletely) from a Vatican manuscript.

[VHRanger]

Right, but the scale is entirely different.

The Conquistadors actively tried to memory-hole Aztec/Maya culture post conquest by burning all their written content.

If you break the oral tradition by dispersing groups and you burn written records, you can wipe a culture from history. Conquistadors didn't succeed at this, but they very well tried.