OP doesn't say that an older system was better - especially not some super-specific one. Just that it's NOT the only possible system and likely not the best there can be.
So I'm not sure who exactly you're arguing with.
Correlation != Causation
As others have pointed out we have better lives today because of scientific and technological progress not because of capitalism.
You're right, USSR managed to accomplish an equivalent of a century of progress under capitalism in the west in a couple of decades.
OP doesn't say that an older system was better - especially not some super-specific one. Just that it's NOT the only possible system and likely not the best there can be.
So I'm not sure who exactly you're arguing with.
Correlation != Causation
As others have pointed out we have better lives today because of scientific and technological progress not because of capitalism.
You're right, USSR managed to accomplish an equivalent of a century of progress under capitalism in the west in a couple of decades.