Allison Rosenberg

The top line thesis — specialization beats generality — is (forgive me) something of a PGIO (penetrating glimpse into the obvious). I do appreciate the distinction between domain knowledge and domain specialization. They're not the same axis, and conflating them is a common mistake. Regretably, the authors stop right where things get interesting. Domain knowledge's value-add is described as diminishing as scale increases, with no stated floor. Specialization's value-add is described as persisting; not growing, just not eroding the way knowledge does. That's a decline running against a flat line, not two things moving in the same direction at different speeds. The authors never say where that decline runs out, or when investing further in expert content stops paying off — compared to just narrowing scope. A distinction this precise about what specialization is deserves precision about when to stop chasing knowledge and start chasing focus. How much is enough? 10K hours worth (a la Malcolm Gladwell)?