I use Blender to for quick prototyping 3D models for games and VR applications.
Yes, I know that they are not top quality, but I'm mainly C# developer not skilled 3D artist ;)
But if I need some 3D objects or animations I can do them myself. Knowledge or creating 3D model, rigging it and skinning also gives me good understanding how does 3D stuff work in Unity. What are bones, how to configure avatars, how inverse kinematics works etc.