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.
Having loved photography since an early age I have always been hyper observant about my own visual mechanics, and to preserve my 25/20 acuity.
At worst in my late teens my prescription was -1.25, at which point I started wearing glasses only for distance vision, never for reading and computer work. I am certain this diligent habit stopped the myopia progressing. Now that I’m 10 years out of uni my prescription has reversed to -0.25. I don’t wear distance glasses anymore and am careful with computer positioning to minimise eye strain. Hope my 25/20 lasts!