Excal..
To me, that is exactly the issue. Normal cars using a single system really don't have an issue. Years ago, I really never gave it a thought either. Just wanted an independant. Then along came Run n Gun 1998(?). A Cobra coming down the straight, broke a weld, (apparently not assembeled correctly per the story) dropped the half shaft, folding the rear wheel in, driving the half shaft into the ground, throwing the Cobra in the air, rear in first, back down then back up. When it came down the sesond time it was still sunny side up, but this time the tank was ruptured and the car caught on fire.
Driver was extremely shook up, but aparently OK. From that incident alone, my mindset went to the Double Wishbone rear end.
I really do like breaking unbreakable axles, bullit proof rear ends, guaranteed U-joints and drive shafts but, I don't want my wheels falling over when I do it!
DV