Didn't read the thread.
1: Zatsiorsky and old russian olympic training manuals say that a greater training effect is had when a larger range of motion is utilized. Good luck getting through science and practice of strength and conditioning, lol.
2: Partial range of motion is useful to train different aspects of the lifts. For example, powerlifters use board work on the bench to overload the triceps and/or practice the lockout. This does NOT substitute for full range bench though.
3: The guys that say partials let them lift more weight... well.... sort of. The way to really test that is to perform a competition bench, then train with partials for however long you want, then re-test with the gold standard; the full range lift. You may find that in some cases, with some anatomy, the full range lift went up. There is your answer. More often then not though, and especially for beginners, full range will be the way to go.