As a "junior" programmer, who didn't work on the big "legacy" codes, but only programmed for specific situations, I agree with your last paragraph. Viome, a company that uses AI to look at your microbiome to determine what you should be eating, the supplements you should be taking, and so on, is a stellar case in point. You can get a different answer from them every time you submit a sample. It depends on the way the health and supplement companies are thinking at the time rather than any changes you may have made in your diet or supplements. I tested them personally. Others believe in them as some people believe in the bible.