> work on cars without ever touching a car. I don't believe the author is saying you should trust someone who has only read about a job to do the job. Maybe y

> work on cars without ever touching a car. I don't believe the author is saying you should trust someone who has only read about a job to do the job. Maybe your illiterate mechanic is great. In every case, a professional will be better by absorbing the experience of others, even if just marginally. Learning from experience of others without having to spend the same 1:1 time and cost is a huge win. Certainly we would all agree on that point. Reading is how knowledge gets transferred indirectly across time and space. I agree there's no better signal of effectiveness than history of results, but with two people who 'get results', considering what can get lost in such metrics, the one who is driven to keep learning from others outside their direct circle is almost certainly better at what they do. As applied: Two mechanics who 'get results' exist. One spends their spare time pouring over Internet forums to learn about emerging issues, diagnosis techniques, tools improvements, part performance over time, etc. The other goes home and plays WoW, their only new input comes from what arrives at or emerges in their shop. I would always favor the former type. No different with any domain.