The theory is that the general public is so bought into rape myths that they can't fairly judge the evidence so rapists are getting off.
I have a lot of sympathy with that view having followed various trials (e.g. the Ulster rugby trial, Ched Evans).
In other countries cases are heard by a trained judge. A good example was the Oscar Pistorius trial in S Africa
I actually think this is a good pilot - I want to see more rapists convicted.