It is indeed due to the lack of medical knowledge. The thing is, so called “generational wisdom” is basically a synonym for lack of knowledge, medical or otherwise. When your go-to source of knowledge is the elders from your community, it stops you from seeking more relevant, and almost certainly more correct knowledge. Community isn’t smart, community is dominated by people who are speaking the loudest, the community consensus revolves around certainty, and people who know the most tend to be least certain in their language.