I am wondering what types of modeling techniques are used for non moving set props in movies and commercials. I was checking this guy's squid models and they are all high polygonal object that are textured without using smooth meshes. Is this the way to go for assets like these in movies or films? in almost every cg breakdown clips i see high polygonal objects instead of smooth meshes. is that the way to go mostly?

heres an example video.
CGI VFX Making of HD: "Metro" by Main Road Post - YouTube

and in these models i only see high polygonal objects. is this bec of texturing and polygon count concerns?

https://www.turbosquid.com/3d-models/...e-model/719634