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> Why are all of these examples of successful government tech investment so old?

There are indeed newer examples such as GPS, RF-CMOS, Lidar, Siri, mRNA vaccines that DARPA invested in one way or another. Not saying they are as spectacular as the internet.

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Not to mention that perhaps the low-hanging fruits are all reaped in the earlier years.

The newer tech might just not be as impactful as the yester-decade's, because those impact is already felt, and creating more impact in the face of today is getting harder and harder. Exponential growth is not possible to achieve in practise.

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