There are many questions I have about grounding. But I am willig to solve them one at a time. I am intentionally avoiding the term "ground" since it has such many usages.

Question 1) Among many reasons, connecting an electrical system to earth provides a reference point for input voltage, therefore achieving steady voltage to loads. But, since we connect all neutral conductors together at the main service panel, why can't the neutral conductor be used as the reference point, instead of connecting the circuit to earth? If I have a neutral conductor bonded at the service panel and no part of my system (not even the service transfromers) is connected to the earth, wouldn't I still get stable voltages to the loads in the circuit?

Question 2) Along the same question ... I also read that connecting circuit to earth stabilizes the "voltage to earth" or "voltage to ground" under normal operation. But, why do I care about the voltage to earth as long as I have voltage to loads?

I'll appreciate your answer.
Sung.