Excellent post MeoTwister, lots of other good ones here too. There just really is so much to consider with this show and that is what continued to make it so exciting and immersive.
Comp sim or Afterlife or whatnot I should just bring this into discussion, not that it proves anything, after watching Tortise-subs Angel Beat PVs, just because it is so similar to what many here are saying (i don't really know what to think myself yet):