Regardless of oral state, cheating is continuous. The process of speaking is not an impediment to cheating. ESR cheating discussion commonly ends with recognition of incapacity for efficacy as regarding inhibition of cheating. However, such discussions make available all critical criteria for observation of cheating. As has been statistically demonstrated, cheaters are quite social creatures, and are often befriended by the innocent and unwitting.
The drive to fight cheating is a misleading emotional charge against an unseen foe. Such a charge is destined to end abruptly. As the shining champion for fair gaming's lance strikes only a weightless dummy, he then reigns his powerful steed in a confused attempt to survey the state of things, and finds himself confronted by a multiplicity of lance wielding, steed mounted dummies smiling dully in his direction as though in support of his cause.
there is no viable alternative. you are right though as someone with the right dedication could remain completely undetected and still push the boundaries. exposing cheaters in this manner provides enough information and discussion to create a guideline to become the perfect hacker.