Yip twist is the number one reason like bolt said. It will make them much stronger when only using 1 servo. That is what Mike had in mind. One hours work for lifetime of strength.

Also one of the best features of torque rods is repair. If you break an elevator half which happens a lot with this large couter balanced profiles 3D'ing in the grass, with torque rod you only need to replace one elevator half. Where on other planes you need to pull off the rudder and the elevator to make the replacement.