Peter, thank you for pointing these out. My thoughts:
1. While there IS a difference in the liquids, in fermenting, I haven't seen too much of a significant one.
2. Most of my hard cider (apfelwein) is made from store bought juice to be honest. Picking apples it awesome, but not needed.
3. completely agree, anything you buy in the store shouldn't have more than the vitamin C additive.
4. It is difficult to find great commercial hard cider, most tastes like candy...all the more reason to make your own!
5. I would bet someone has!
6. it CAN be done with work and diligence, but yah, use those for apple sauce!