Two of those are manufacturing mistakes, and it seems likely the door one is as well. Not that that helps the passengers, but they're not systemic design flaws.
That anti-icing system is deranged, though. They effectively installed a timed detonator on the engines and want a safety exemption for it.
That anti-icing system is deranged, though. They effectively installed a timed detonator on the engines and want a safety exemption for it.