That is the only sense in which a 'universal file system' can win. There is no other context. Your personal usage habits are completely irrelevant ("I haven't had to shoot a gun since the first gulf war, so to me it's a massive surprise that anyone still fights wars at all.")

I don't use USB keys. I don't have any windows systems. But I do have UEFI, and that is based on FAT as well. Disregarding my grandmother's technical prowess, this technology is here to stay, and sticking your head in the sand about it doesn't advance any causes.