“On its surface, [vertical specialization] does seem like a limiting choice, but if you’ve never gone beyond a surface level of expertise, I can understand how you’d have trouble seeing the richness that lies beneath.
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It’s like seeing a small. plain-looking mouth of a cave and not knowing that what actually lies beyond the mouth of the cave is a fascinating, complex system of caverns, sparkling with jewel-like mineral formations. Most vertical specializations will be just as interesting if you go deep enough.”