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You can simulate 20 qubits with 2*21 floats. So nothing you couldn't do with your laptop.

A 20-qubit quantum computer is not yet capable of outperforming classical supercomputers for most real-world problems. It is a first fully operational hybrid quantum supercomputer. Most likely to run tests in the real world scenarios.

> A 20-qubit quantum computer is not yet capable of outperforming classical supercomputers for most real-world problems.

This isn't the right way to think about this. No amount of qubits would allow you to outperform a classical computer on "most" real world problems. That is not how quantum computers work.

However you are right - anything quantum right now is proof of concept for the engineering problems, not being problem. (If you are being generous. If you are being less generous its about creating PR to get people's money)

Obtain and spend millions in grants.