[29athrowaway]

Paper is thin, light, durable... you can make books from it and transport them easily. It can be manufactured from materials available in abundance in Europe.

A book made of wax tablets, or velum is not as good. I don't imagine vast libraries and universities running on books made of wax tablets or velum.

With respect to Papyrus, I agree. The Great Library of Alexandria was all papyrus. It can be produced at scale. But Europeans had to import it from far, far away.