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Hard/impossible to respond. Every workload is different. It can be mostly compute bound (Linpack), communication bound, a mix, very latency sensitive, etc. Imho, it just depends on the workflow and we should probably use multiple metrics instead of just Linpack peak TFLOPS.

That's like asking what the benchmark for an engine is. It all depends on what you're trying to do with it. There's no single metric to compare a diesel semi truck engine to a 2 stroke golf cart. You need multiple measures and the importance of each is dependent on your workload.

They never have used flops to measure supercomputer performance.

Its GFLOPS in HPLinpack (dense matrice multiplication)