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Carmack himself has done a lot of work on end to end latency, during his time at oculus.

This is Carmack, who builds new things. He built one of the first 3D game engines based on the hard math.

Reuse is not always necessary - sometimes things are just done for fun and exploration, not for appeasing thirsty VCs and grabbing that market share.

Reinventing the exact same thing and shouting from the rooftops about it is exactly how you appease thirsty VCs and grab that market share.

Why would John Carmack who is so rich that he does things for shits, giggles and personal development, give a hoot what a VC cares about?

Might I interest you in my new startup, that is a bus, but with technology?

And plenty of other people.

It's still a lot better to really learn and discover it yourself to really get it.

Also it's hard to determine how much time someone spent on particular topic.