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"All that said, I do agree with the view that physical world innovation has been frustratingly slow. "

One more argument comes to mind wrt the above passage. We are now more hyperconnected than ever before. When a field is _hot_, people pile onto the field in hopes of making it big and being a part of the global conversation, as opposed to dilligently working on something that has less appeal or looks less promising. In bygone days, circles of influenced were more disjointed - the crowding effect was confined to one's immediate surroudings and ideas were more isolated, leading to many parallel breakthroughs. It was far less easy to get distracted.

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Dixon talks about the advantages of "public good" open protocols such as SMTP. The downside of these is that they evolve much more slowly than proprietary ones. There's an excellent discussion of the tradeoffs here: https://youtu.be/Nj3YFprqAr8?t=276

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