In defense of my analogy, a reader writes:

Jonah,
Hope all is well. Just wanted to help you in your defense of the two books DNA comment (although you seem to have backed off a little, but anyway). You may have gotten it from here, so forget it if so, but the exact same comparison was made in Dr. Jerome Lejeune’s famous testimony in the Tennesse embryo trial. I suggest reading the whole thing, it is fascinating, but on pp.32-3 he makes the exact same point, in slightly accented French (copied below). The father of modern genetics stands with you 100% on the DNA analogy. Hope all is well with the family.
Q. Certainly. I think I have read somewhere, and I’m sure if I’m not right you’ll correct me, that genetically as far as the chromosomes, as far as the contents of the DNA in the chromosomes, for instance, man, Homo sapiens, and the higher mammals, particularly the gorillas, chimpanzees—help me look for that species.
A. Orangutan.
Q. There is a remarkable similarity?
A. Well, it depends what you remark. You can remark the similarity, or you can remark the differences. And difference is incredibly interesting. I don’t know where you want to ask me.
Q. Well, I have heard it said or read that approximately ninety-eight percent of the genetic material that is found in a chimpanzee or gorilla is identical to what may be found in a human being.
A. It has been written, and it has been written by statistical calculation of the DNA but not about the meaning of it. Now, what makes ninety percent similarity in the number of words in two different texts? They can mean something very different by the way the sentence are made. It’s what makes the difference between the species.
Q. But there is a similarity in the DNA?
A. Oh, yes, exactly like the similarity in the fact they have two hands like us, not the same thumb, but they have hands, we have feet, but they are the most similar to us, no doubt. It’s no surprise that the DNA also has some similarity.