Very common here in Norway, at least. Drywall isn't just to create solid surfaces between structural timber, it also helps dampen sound and provide a flat surfa

Very common here in Norway, at least. Drywall isn't just to create solid surfaces between structural timber, it also helps dampen sound and provide a flat surface for paint. A poured concrete wall is very rough and would require plastering to get a flat, smooth surface, which is more labor-intensive than just drywalling.