You're using the colloquial definition of productivity while PG was using the economic definition. The economic definition has nothing to do with how hard you w

You're using the colloquial definition of productivity while PG was using the economic definition. The economic definition has nothing to do with how hard you work--it has to do with your economic output. Bill Gates working at McDonalds would be tremendously unproductive (by the economic definition). A farmer who works the land manually is much less productive than one who uses a tractor, even though the manual laborer is probably working "harder" than the technology-enabled one.