Customer support obviously know more than me and I defer to their knowledge.
But I don’t believe it. I do not think each bud is physically coded with the serial number. I think the case is and when reset each bud gets their S/N from the case through data through the pins. My reason for thinking this are that the reset instructions are all related to the case, reset button on case reset the buds when in the case and case is on via being open. The case is controlling everything. I think the case gets the hardware code of each bud and shares it with the other bud when in the case. That way the factory can make a thousand L buds, a thousand R buds, then just place a L and a R in the case and pair them to each other in the case.
I expect the two buds to be required to be identical versions of hardware, and over time the hardware slightly changes so different buds not from the same batch won’t work together.
I think in the factory the worker takes a L bud and a R bud and put in a case, and do something, like a special button press. I think the special press is just the reset instructions, or similar. If similar we just need support to tell us what they do in the factory… could be press and hold for 20 seconds. I’m guessing and so won’t be correct.
I don’t believe they are manufacturing each bud as a pair, physically burned into each pair their S/N, that would be a costly step as then each bud would have to be kept tracked from manufacturing through the process. It would also cost more as if an L / R bud was bust, didn’t pass testing, the R / L bud would have to be destroyed too. So no, I don’t think each bud is hard coded to the other bud.
I also have healthy skepticism of why they say it can’t be done, it blurs warranty process.
I think they solve warranty issues by just sending out a whole new set, sometimes refurbished to keep costs down and if its not all their fault (e.g. customer lost a bud) they use goodwill gesture of a discount off new (e.g. 50% off) which is still less cost for them than keeping stock of buds separately.
I know you guys are thinking these are $100+ buds and expensive, but really, the raw hardware cost is likely around $20 or less.