Can we only create model with primitive with Unity without import model from Blender or 3ds Max ?
I explain to you, i love to create poly model with primitive on Unity (Cube) and i just to make a poly game so does creating such a model with Unity can become a problem ?
You can certainly assemble entire scenes out of cube primitives (I did it couple of times), but doing that in unity is awkward, plus performance won’t be very optimal. There are also some assets that allow scene editing inside unity engine.
I’d recommend to use a 3d modeling program to achieve desired low-poly look.
but yeah pro builder is good for layout a level, and doing basic stuff, but if what you want is even the tinniest bit complex, just get and learn how to use a problem 3d package
I normally use Hexagon and Carrara for low poly modeling since they are simple and affordable. Otherwise for non-artists it seems like a never ending learning curve to master all the complex and popular 3D packages.