[srdone]

What prevents anyone from learning all they need about any subject on their own? If someone is capable of reading, it seems to me they could teach themselves any subject using books. Of course, having a good teacher to guide them in which sources to read, etc, would greatly speed up the process of learning. However, I don’t see any reason someone cannot learn any subject on their own.

[sidlls]

Books provide the basics required to understand the field. They don't help develop intuition, methodology, collaboration, and other skills necessary to truly understand the field or teach it to others.