RE: PPM, PCM ?
I don't know which term is more misleading, "failsafe" or "lockout".
To me this is where most of the problem lies, with these terms. Generally speaking, the PCM system is a type of "noise" filter, and as soon as the noise is gone, the control comes back in about 1/50th of a second.
Now if the claim is that while PCM filters all of the data (good and bad) and PPM lets some of the good data through...well I have rarely seen a slightly corrupted PPM signal.
And the PCM we are using really does not hide anything, quite the contrary, on the JetCat ECUs, you can see how many failsafe events (shorter in duration than the shutdown interval) occured during a flight. It is great to check this flight after flight. Usually, it is zero, then you might see a spike. This is a good advanced indication of a problem. Seen it many times.