Ok, so you're giving a business reason to not collect smaller samples. Which is fine and totally valid. Theranos was under the impression that there was an untapped opportunity for smaller samples.
But, the wording of the parent comment was saying that it was supposedly clearly technically impossible because of the small sample size. The OP said "I just never, ever understood how the sampling rate could ever work" and "and this should've been screamingly obvious to everyone since the beginning." That seems very different from "this is a very hard problem due to X, Y, and Z", especially since commercial machines that everyone here gets blood results from are already only taking small samples from the collected vials so the biggest challenge just seems to be in the collection and transport.
I agree that everything is easier with a bigger collection size, however "hard" is different from impossible.
