Some interesting views, mine is a compromise.

I start out with ppm on a new jet model. With all the metal against metal, pumps solenoids, long leads and ecu's the potential sources of interference are far greater than in any other type of model. I would rather know I have a problem to solve, rather than use technology i.e pcm to be more tolerent to any problems that may exist.

Once the model has been proven on the ground at various distances/revs and is shown to failthfully follow my commands without glitching, will I put in a pcm receiver and fly it.

If you go straight to pcm and interference(noise) does exist, you might be at an attitude/distance where failsafe does not protect you or your model once the noise exceeds the signal.