I don't question your understanding of it. The proposed experiment was rhetorical to remind you or it. I think you aren't applying it in your logic. Gradients matter. You were talking about cause and effect, claiming that greater causes have greater effects even on small scales like earth. But that isn't true. Change requires an energy gradient. You can't sit in a boat in the middle of lake Meade and admire all the energy you have. It is useless. Yes there is a ton of energy there but it cannot create change with no gradient. You have to be local to the dam to do anything with it. Even a small stream with a foot high waterfall creates more change than being in the middle of the lake.
Likewise, over the vast distances of the galaxy, the potential energy difference from one side of the earth to the other, is miniscule. This is why our compass doesn't even register it. Yes the absolute energy is enormous but it cannot effect humans on anything like the scale of a refrigerator magnet falling off your fridge.
Super novas are a whole 'nother thing, very gradienty.