[tialaramex]

The key word you missed was contrived. The current problems solved to produce "Quantum supremacy" are basically "What would this quantum computer do?" and yup, the current quantum computers can answer that by doing it and a simulation is harder, but this is a contrived question.

Shor's or Grover's aren't contrived problems, they're real problems which is why they're interesting. And none of today's quantum computers can run these for non-trivial inputs.