You're just patching a specific bug by adding a special case for it. That's no way to engineer anything. Also, you use the typical fallacy of a fix being just a

You're just patching a specific bug by adding a special case for it. That's no way to engineer anything. Also, you use the typical fallacy of a fix being just a minor bit of work. If it was low cost and easy to do it'd be done already. Batteries are big and heavy. Increasing the size and weight of the black box is a tricky proposition because it would make it more vulnerable to damage, so you'd need to re-engineer the whole thing to make it stronger. That would make it much heavier and much larger than it's been. And because of such major engineering changes you have to completely redo every aspect of testing. Then you have to begin manufacturing new ones and replacing them in every single plane out there. And every single plane now needs to be extensively retrofitted and updated.