If I had my way, regulations would require a physical connection for all door handles, and not just that a secondary physical release be available. I don't know how you would go about finding injuries associated with each design as a layperson, but I bet there's a death or two associated with each novel design.

An old man roasted in his Cadillac XLR because the battery was dead and he didn't know where the secondary release was. I think it's under the seat on that car. I don't care how cool that electronic door release was, or if the old man was negligent in not knowing his exits; it wasn't worth his life.