Wouldn't that mean that Galileo and Newton's discoveries would have had little to no impact?

For modern endeavors, it's hard to see how anybody who didn't have a detailed education in the subject could really contribute in a useful way to debunking junk science. I can see this happening for papers that can be dismissed outright because the authors made egregious errors in the study design or data collection (where data scientists/statisticians who don't work in the field can still be very useful), but for most modern physics or medical research, there are literally hundreds of years of well-established theory and practice that you absolutely need to know before dismissing ideas that don't make sense.

This is especially important in areas like infectious disease.