[YakBizzarro]

Quantum supremacy, while a very interesting experiment and a milestone in quantum computing, proves hardly anything about usefulness of quantum computers. It "only" proves that quantum computers are the best quantum computers, and classic ones can't efficiently simulate them. It say nothing about useful operations.

[s1dev]

From a theoretical point of view, this is evidence that quantum computing is a more powerful model of computation. I think it would be hard to argue that a model of computation that can solve more problems is any less useful. Applications like quantum simulation do appear to be difficult on a classical computer yet efficiently computable on a quantum computer

[kbelder]

Basketball is hard to simulate on a classical computer, but easy to simulate by playing a game of basketball.