If you're still running carb think this way:
All the benefits of an injection system - smooth running down to almost 100rpm, smooth pickup, and will run on almost any angle without flooding or starving (including upside down!)
You are correct there are off road benefits but
Marshall (Trollhole) was thinking about the benefits of fuel economy. He already is going to have TBI fuel injection so he is covered in that respect. compared to a carb, gas injection does have benefits for off road applications