That’s all true, but also completely irrelevant to the point I was making. Gene expression isn’t in that 99.9% of the DNA that is the same. All of the individually identifiable genetic information in the genome is in the other 0.1%. This is a privacy community. A complete understanding of how genetics works is neat and all, but it’s not relevant to the conversation we’re having. I didn’t say that all humans 99.9% identical to each other. That’s obviously not true. I said that there’s no point in storing duplicate copies of identical genetic sequences, and that saying they store less than 0.1% of your genome only says they’re not doing that.

For the record, 5-10% is way plenty to narrow things down to a very tiny number of people. Probably one in most cases, and it contains a lot of important medical information. That’s not some trivial unimportant thing.