This makes no sense and is difficult to even respond to coherently.
> It's funny that as an industry we now know how to safely deploy software updates to hundreds of millions of phones, with security checks, signed firmwares, etc,
Either you're completely wrong, because we "as an industry" still push bugs and security flaws, or you're comparing two completely different things.
> doing that on applications with a super high unit price tag seems out of reach...
is true because of
> a few millions is like only a thousand hours of flying in jet fuel costs alone
like do you really think they spent millions pushing a line of code? or do you think it's just inherently expensive to fly a jet, and so doing it twice costs more?