Both strands - the 'more space for better cooling' and 'miswiring' - create yet more questions. How can you go through design, testing, certification and operation without spotting an overheat problem in a lithium battery pack where heat is one of your number one enemies and demands the closest of attention? It's like designing a petrol tank and not bothering to make sure it's vapour-tight. Any basic design problem that is first spotted through its combustion products is more than a basic design problem.
As for miswiring - how many levels of test, inspection and approval did the packs go through?
I hope some competent entity is given the brief to shake the regulatory process as hard as possible and see what drops out. Who that might be, alas, I don't know. If the level of incompetence approaches criminality, and as pax in danger of incineration I'm sympathetic to that view, then I wouldn't be at all sad to see the forces of Laura Norder get their size thirteens through the door.