Depending on your definition, this actually is not peak performance.
Subways are.
Obviously, the tunnels are absurdly expensive, but nothing moves as many people as quickly around a city as a subway.
They’re also extremely reliable, meaning people are even more likely to actually use them, and their above-ground footprint is essentially zero.
OK, I’ll bite:
You appreciate civilization because you’ve lived in nature.
People die of starvation in a world that literally has enough food for everyone - because speculating with food is more profitable than feeding them.
People die of diseases that have known cures with low production cost - because the market will only finance medical research if the resulting drug comes with a net gain price tag.
There are literal wars being fought and people being shot for economic gains.
Humanity doesn’t have a resource problem. It has a distribution problem.
And the current method of deciding distribution of goods is capitalism.
Genuine question: Where do you believe a millionaire’s millions ultimately come from?
There is only so much net economic gain one can create with their own two hands. Everything beyond that is created by other people’s hands.