Not true. Consider https://en.wikipedia.org/wiki/Library_of_Alexandria Scribes are just lower efficiency, like wood-burning railroad trains vs. horse-drawn wagons.
Not sure what you mean by "advanced literacy", but credible experts seem to put literacy rates in Ancient Rome (zero printing presses) in the neighborhood of 20%. If you consider how little demand (for printed material) there could be from slaves, rural peasants, and such - that's damned high.
You seem focused on books with enormous page counts, requiring 6 months to a lifetime to copy. That's really not how societies without modern (ultra-cheap) printing technology did things. Same as their horse-drawn carriages didn't weigh anywhere near what a modern SUV does.
(Yes, hand-copied Bibles were big. And rare. Are you trying to judge the size and cost of typical medieval buildings by the surviving the cathedrals and castles?)