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Counterpoint to your comment: Mechanical calculators were cheaper, more reliable, and well understood. Early computers were bulky, expensive and needed a skilled team to operate, until they transformed everything. Quantum tech may follow the same arc.

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Love the "may". Why should we assume it will follow a similar trajectory? For one, the bulky computers of olde were already useful. These machines were not built on the vague promise of future usefulness. Second, even theoretically, quantum computers are not that useful. Take a look at [1] and tell me what you think is useful enough to justify 200 billions in investments.

[1] https://en.wikipedia.org/wiki/Quantum_algorithm?wprov=sfla1

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