Low pH is needed for pepsin to work. Also to kill some pathogens. Doesn’t affect nutritional components of ingestion eg amino acids, vitamins and lipids.
This is consistent with the supposition that low pH is needed to kill some pathogens.
An interesting fact is that humans have a stomach pH in the scavenger range. This is consistent with the supposition that, before becoming the most successful hunters of this planet, for a long time humans had been mainly scavengers, who scared the other scavengers and predators by throwing sticks and stones, and then consumed completely the leftovers by breaking the long bones and the skulls with stones.