That's a misconception, and a dangerous one to perpetuate. A PCM failsafe just sends the controls to a pre-set position. It does not simply straighten out the plane and make it fly ahead until the interference goes away.

The failsafe position should not be set to neutral controls. The purpose isn't to save the plane. That is not possible without control. The purpose is to crash the plane. I know that sounds counter to your notion, and it should. PCM failsafe is a safety feature for people, not for models. The throttle should cut, and the controls should be set to spin the plane. Anyone who suggests otherwise doesn't understand the purpose of the failsafe, and doesn't have a realistic notion of what it is capable of.

Yes you are, and we all were at one point. Don't be upset just because you're sometimes wrong. There's an amazing depth of knowledge to be learned in this hobby. I don't know it all, and I never will. That'll keep me interested for a long, long time.