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"gadfly", why is it so important to you that David doesn't do as he's said he would - provide specific examples of how I'm wrong? Why are you protecting me? What are so you afraid of that you would encourage someone else to go back on their word? I appreciate your support, but really, I can deal with it if you can.
BTW, the reason you can't distinguish between 1) the acceleration of an elevator (or "chest" in Einstein's description) in space and 2) it's station on the earth's surface (leaving aside the issue of curvature or a "uniform gravitational field") is that both involve inertial acceleration. On the earth's surface a body suspended by a rope from the ceiling of the elevator is prevented from following its geodesic, i.e., from gravitating toward the earth's center of mass, by the tension of the rope, which causes it to accelerate out of its geodesic path. The latter case is a prevention of gravitation. So yes, leaving aside curvature, you can't distinguish them, because their equivalence is between inertial acceleration and inertial acceleration.
I hope that calms you a little.