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What Google did was demonstrate exponential error correction, which is critical due to qubit fragility, requiring multiple physical qubits to be combined into one logical qubit to avoid a collapse into a classical state.

But the calculations they performed are not generic, general purpose calculations. Instead, they ran a specific type of computation, the random circuit sampling (RCS) benchmark:

https://research.google/blog/validating-random-circuit-sampling-as-a-benchmark-for-measuring-quantum-progress/