This is quite possibly a misunderstanding on my part. It looks like models are always shaded with flat polygons, and the interpolation setting has no effect. Regardless of the setting (Flat, Phong, Gouraud), all polygons are flat (see image below). This is using the “Lights” module, set to Default lighting. Shouldn’t Phong or Gouraud interpolation result in a less “faceted” appearance or am I mis-remembering how these work?
Preview 2021-12-19, MacOS, MBP 16" AMD Radeon Pro 5500M 8 GB.