As I mentioned previously, I make no pretence at being a technically literate or anything near that only thinking of a simple solution, but I am having trouble understanding your reply. Does that mean from what you are saying about retrofits and afterthoughts, that Airbus fitted newly designed wings to the A380 when they had wind problems or did they make a retrofit to cure their problems. I would have thought doing a retrofit as the initial design is faulty would be the natural way to go. I can think of plenty of aircraft that have needed retrofitting to make them safe. Maybe I am misunderstanding your comments in some way. And my dear friend, I to do not wish to sound impolite!
From one that is technically illiterate, I look at the the Tesla electric motor vehicles powered 100% by lithium Ion batteries. To keep those batteries from thermal runaway affecting the adjoining cells, they run coolant past each of the cells. Even some laptops and mobile phones have had problems with lithium batteries overheating. I don't know why the Boeing Company don't run coolant through their batteries.