What are we to learn from this?

Did you check pressure on no start after two hours? One day? How long does it take to drain back down to near zero?

I was fooling around awhile back with my car and it also showed no pressure after setting for a couple weeks. I think it is prudent if one has not started the car in a couple days to delay the key at point three (dash lights all on, but no start) for a few moments before turning the key to point 4 to engage starter. Thus giving the fuel pump a moment to run, build pressure before starting car. That should help prevent any rough idle or air entrapment at the injectors at startup.