The shortest answer to that IMO is this.
If you make certain there are no grounded objects in the home, it would be almost imposable to receive a shock.
A line to line shock is rare, you would need to stick your finger firmly in a light socket or some other unusual activity, and if you do that a grounding conductor only hurts you.
To do this would mean isolating the plumbing, gas piping etc.
We are getting close to that already with the use of plastic plumbing.
It took me some time to think in this way but it does make sense.
Outdoor outlets would still need grounding.
JMO, Bob
