> The oral tradition of vedic learning has preserved the entire vedic texts by purely human memory for several generations. This in an enormous accomplishment given the vast corpus of text preserved without any errors creeping in.This has been made possible by a diligently devised systematic scheme of chanting the vedic corpus.

A system of chanting for memory has been used since pre-history across many cultures. See for example Greek epic poetry, Hebrew Scripture, Arabic Koran, Anglo-Saxon Beowulf, Viking sagas.

In ptr-literate societies, bards were able to memorize huge amounts of information and recite to their listeners. Much of the poetry with its rhyme/meter/repetition was written that way to aid in memorization.

That sort of memorization got a lot less as literacy grew and people could just read stuff for themselves, but it was pretty widespread and certainly not something unique to the Vedic tradition.