I mean exactly what I said: anyone who has this fear, which is untethered from reality, should not trust their intuition about what mechanisms are important for safety.
If (a), then you’re wrong. It’s exactly because this has been going on at Boeing for years (and because planes are so outrageously same that they can get 10x more dangerous without it much affecting the assessment) that we can upper bound how much new risk there is at a quite small level.
If (b), at least you’re being honest.
We know about the bolts because a door blew off a plane mid-flight, do I need to tell you how we know about MCAS?
Air travel is the safest but thanks to the exact opposite mentality you are presenting.
Science&technology is not a God and engineers are not the patron saints.
We know about the bolts because a door blew off a plane mid-flight and there are reporting requirements when that happens. Then there is an investigation.
When a door falls off a car driving down the road, the driver picks it up and puts it in the trunk and has it reattached or replaced. Whether they even file an insurance claim depends on their deductible and either way nobody is doing a root cause analysis to prevent it from happening again.