You literally just proved theieindjri's point. (Assuming you're a smart person) these edge cases, even if they are clustered, even if they happen repeatedly, are NOT easy to fix. Partly because there are so many of them, partly because they only arise with a specific combination of events/circumstances that are difficult to replicate, partly because navigating them safely relies on facets of the human brain that AI doesn't perform, partly because the consequences of failure are so severe. "That much easier to detect and correct" vastly underestimates the difficulty of providing safe, automated driving.