I think with all these Gismos available today like T-Can,Modern radios Contras, Electric motors with speed controlers......etc etc...we are actually loosing the abilitiy to fly the airframes without their help.
I doubt it very much that an Electric/Contra flier can fly an IC powered plane as good.
The irony is that the world Champion flys IC with T-can and thingies.....
Contras should not be allowed as they provide a distinct advantage not having to deal with torque and Propeller P factor. At this F3A level such a setup offers a real advantage. Need to be able to stealthy use that rudder and be rewarded!