I can still ghost load* my M2 with the MOA Precision auto load parts. Since the J-Kenny parts use similar design mechanisms I suspect you can still ghost load, but I have no first hand experience with those parts.
* My M2 bolt has the usual modification that allows ghost loading
If it bypasses most normal operational features ... I suspect this is something that might be more predominantly used specifically for competition.
I can understand how some people might say that if it is ideal for competition then it should be a benefit to home defense as well as combat. I would agree with that, but I do appreciate certain normal operational features that the Benelli M4 has.