----- the big one is, if you have a stalled servo, it is taken out of the circuit and still have a chance to land your plane.
This is not true: there's a video around that shows mr emmerich proving exactly the opposite on a powerbox royal.
What happens in the video is he shorts 2 (very small gauge) servo wires (black and red).
The other servos keep working while the 2 shorted ones eventually burn out and the circuit breaks.
So all the pbox does is overpower the short and keep feeding the other servos enough current (provided the batteries can keep up and have enough charge left).
Now imagine this happens with a shorted servo, maybe in the tail. Maybe a big servo, with bigger gauge wires.
What happens is your whole line, from the powerbox to the servo, turns into an electric heater, becomes scorching and eventually melts the other wires that run with it, causing a catastrophic failure, or even a fire.
This is exactly the same thing that would happen if you hooked your batteries directly into the servo current feeding line (not through receiver).