I'm curious - is there convincing evidence that baby formula is (absorbed-)nutritionally incomplete compared to breast milk? I know it produces worse health outcomes, but I haven't found decent claims on whether that's a failure of nutrition, or only a lack of side-channel influences like immune-system boosting.

As a more general principle, I certainly agree that Soylent might miss the mark on dose and accessibility of some nutrients. The early development history shows that they definitely have in the past.

It's definitely good to see someone trying. My only real concern is that they might miss a low-effect or slow-acting component. If they forget potassium, testing will happily reveal it in a month. If their calcium bio-availability is a bit low, maybe we don't see it until Rhinehart gets osteoporosis in 20 years.