I agree growth is good, but shouldn't we then ask what causes growth or halts it? The post does not explore this, but Sam seems to assume that growth is caused by government investment in infrastructure, science and technology. This is false. What are real concrete examples of this abstract idea 'economic growth'. Many of the best examples are actually due to individuals acknowledged in the post such as Peter Thiel and Paul graham. Growth comes from individuals like these choosing to invest in entrepreneurs (at various stages) based on their judgment. Those investors who judge right enough accumulate more capital to reinvest and continue encouraging growth as long as their judgment about what should grow is good enough.
Sam seems to suggest that growth is achieved through government investment. I disagree. Every dollar the government spends comes from a Peter, a Paul or an Elon. Who is going to do a better job investing and causing growth? Elon or a government bureaucrat. Elon is one of those rare entrepreneurs who has plowed into areas of deep regulation such as space travel and transportation. Imagine if the government wasn't financing roads with money taken from those accumulating capital, then how much easier would it be for Elon to disrupt transportation and grow that industry through innovation? How many more entrepreneurs would be willing to work in that industry?
Each of the most broken and stagnant industries are most touched by government: education, healthcare, defense, finance, transport, and energy. Growth has happened in software/tech because government is far away meaning it is easier to work on problems free of intervention and more people are willing to. Growth has stagnated in these other areas because government has disincentivized entry (and often teamed with established inneffectivr big cos) by getting involved, regulating, giving away for free, and generally making it difficult to impossible for entrepreneurs to enter and thus undesirable.
So what has caused growth? Individual investors and entrepreneurs exercising good judgment. What has slowed it? Government regulation as government has grown its tendrils into more and more areas. What should we do to promote growth? Shrink government leaving investors their money to invest and opening more industries for potential private investment that won't have to face burdensome regulation or competition against public entities that don't try to profit.