I'm a little confused here.....

If you have three ground wire segments into a recepticle box (one
pigtail attached to the outlet, one coming into the box and one exiting
the box) and remove the pigtail from the outlet (where it's screwed to
the outlet) to service it, how is the continuity of grounding for the
rest of the circuit interrupted at all? Removing the pigtail from
the outlet still allows the wires coming into and going out of the box
to remain connected and thus maintain the continuity of grounding for
the rest of the circuit.