There is some interest at least here to avoid composites (combining different materials) and instead make for example the wall out of one material, just make it

There is some interest at least here to avoid composites (combining different materials) and instead make for example the wall out of one material, just make it thicker so it can handle strength, insulation, sound proofing, breathing and other demands. An alternative is to make sure that all materials are breathable and dryable. But even things like glues can be problematic. I have seen houses that have been almost completely made out of pure timber (no glue!), nails, wool, clay and chalk. Some steel joiners. No glue. They don't even have regular paint in the rooms, it's clay with a hemp mesh inside and then chalk on top, or some such. I don't know how the bathroom was handled.