What is it about "the genetic material he provided is hard-wired to provide fast fetal growth," that you have difficulty seeing?
If humans could make their own vitamin C they wouldn’t get scurvy.
If humans could make their own food they wouldn't starve.
Notice that there are several differences in the sequences (although the chimp and human sequences are identical) not just the astrix. However all Ape sequences have the same frame shift mutation.
Look again, the chimp and human sequence are different. And I know that there are several differences in the sequences, since I am the one that first introduced the comparison years ago. And as I point out, the frame shift occurs at a hot spot. The rodents differ at that point.
Providing fast fetal growth determines the sex of the offspring? Who knew?