I use MOI3D for the same type of models that many Blender modelers go to addons Hardops & Box cutter or Fluent to produce. I have Fluent but find MOI3D much easier and a lot more straight forward.

I do think MOI3D has a place in my car modeling, perhaps not for car bodies but it appears ideal for creating car frames, wheels, tires, engines, car differentials, etc.

My initial reason to get into 3D modeling over 20 years ago was to produce assets to be used in my Vue (e-onsoftware) renders and later DAZ Studio.