FSD does not work poorly, you're just not paying attention. It's astounding and I wish everyone was using it instead of driving themselves. It would save thousands of lives. Autopilot is no worse and probably better than most adaptive cruise control systems.
Good that you see the difference. I would argue innovation is far more important. Electric lighting was invented 80 years before Edison. It could provide light for a few minutes.
Megapacks currently use prismatic lithium iron phosphate cells from China, not sure where the packs are assembled. Megapacks are assembled in their facility in Lathrop, CA. Expect cells/chemistries used to vary widely for Tesla Energy.