Certainly, they knew more "things" but had failed to grow in either scope or depth. It's really easy to let career development and general-purpose learning go

Certainly, they knew more "things" but had failed to grow in either scope or depth. It's really easy to let career development and general-purpose learning go to slack when you believe this thing you're spending 80 hours per week on is going to make you rich and change the world-- and when you're surrounded by people who (equally irrationally) believe the exact same thing.