the Augustine passage is a fascinating piece of evidence, but i wonder how much we can infer from it about the wider reading habits of the ancient world.
Moveable type was invented in the 11th century [1]. Kublai Khan moved in in the 13th. Then the Mings spent a couple centuries being autocratic menaces, Qianlong went on a pogrom of China's scholars and Europe caught up.
By the 13th century, China–uniquely–had both moveable-type presses and joint-stock companies. A combination of bad luck (the Mongols) and a tendency towards political shitshows squandered that lead.
[1] https://en.wikipedia.org/wiki/History_of_printing_in_East_As...
You have to know over two thousand characters to read classical Chinese, with some appearing very rarely.