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As an RF/Microwave engineer, I think the elephant in the room are the control electronics. Presently these are racks of equipment for a few logical qubits.

Isn’t there a spareness limit to the qubit arrays to maintain entanglement? How are the read and write electronics going to be reasonably sized, or ever going to achieve the density needed for a million physical qubits?

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Are there any problems for which that number of qubits is needed? The problems in physical chemistry that I have seen seem to require up to about 250 qubits, and cryptography seems somewhat more economical.

Any practical problem requiring only 250 qubits is in reference to error-corrected logical qubits. You need about 10,000 qubits to create one error-corrected logical qubit.

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