No, we are on the same page. I'm familiar with how it works in most OEM vehicles currently. Obviously wireless cell taps would be very much impossible (wireless electricity)! I just don't think there would really be any cost savings. 22awg wires for CAN communication with balance boards is a cheap and simple solution. Wireless is not as simple, and I can't imagine it's as cheap (although I'm not sure).
I need to learn more about it though for sure.
Most definitely cheaper. 22awg is cheap, sure, but a battery pack is ~4x5 ft? Just guessing, but if you have say and I'm just doing back of the napkin here, 96 cells, then you still have to run 1 22awg wire between each cell tap and a perfectly centered BMS about 32in, with copper 22awg copper at 514 ft/lb means about 2lb of copper, at 4.3$ a lb at the time of this post, so ~$9 of copper before you price in the creation of the small wiring, sheathing, and upcharge for creating the wiring. Then add the cost of connectors per module, tacking on per supplier profits, etc, and again, adding up. Then the connectors on the BMS master and the many many additional traces on the PCB and overall size increase that result.
The components on the PCB, even looking at it, are a handful of surface mount components and a small cheap IC. The wireless bits are cheap too. And no long distance high cost copper wiring. My guess is that even in material cost they're 2x ahead of a wired BMS setup at scale.
But this is all back of the napkin material
cost. The real cost is that they're saving some fraction of human time on an assembly line. Each of these connections to each battery module takes time * wage cost, plus perhaps quality control, which I'm guessing is at or above the material cost.