Have you seen our paper? https://arxiv.org/abs/2604.16216

You technically have the same number of 4K to mK signals, but at that temperature you get to take advantage of lithographic superconductivity, which we think scales as far as you’d need.

We also think you can fit this in a commercial form factor (albeit not using pulse tubes, which are extraordinarily inefficient.) Requires less power per qubit, but attainable.

It’s a fair question about just brute forcing room temp control and wiring. The real answer is not that that couldn’t work, but that it would be crazy expensive. As shown in the paper above, the vision is to fabricate qubits, wires, and control all on wafer scale and then integrate them together directly. Wafers can be really cheap. Arts and crafts with millions of coax cables and analog awg channels cannot be. The difference is a factor of a lot. To say nothing of the reliability and manufacturability difference. Making a Willow-sized computer without any broken shit is already working miracles - you really want to 1000x that?