Traditionally, many Indian classics were transmitted orally. This supposedly led to a lower error rate over time because if I mistranscribe a letter in a written text, all descendants of my text will have the same error, but a single misspeaking in oral transmission is unlikely to persist. On the flipside, the classics tend to be shorter and gnomic and rely on commentary to make them intelligible. They also needed to create a system to preserve old Sanskrit pronunciation even after the spoken language changed.