RNS doesn't really map to the OSI model very well. It takes up basically every layer, 2-6, although it does depend on how it's used. The image on https://linuxinabit.codeberg.page/blog/reticulum/ quite near the top explains the difference between Reticulum and, as an example, TCP fairly well.
Your point about not having encryption is really quite interesting to me. I would want to add some form of signing to prove something came from somewhere unaltered, but that would go against the idea.
Your point about not having encryption is really quite interesting to me. I would want to add some form of signing to prove something came from somewhere unaltered, but that would go against the idea.