For people who live in squalor, you are correct, there would likely be nothing to notice.Specifically on that flight, what was the larger problem? Did the plane have an emergency landing as a result of that larger problem? Did the plane crash as a result of the larger problem?
However, for the rest of us, who notice broken things and wonder what else is broken that is not seen, we are somewhat discomfited by it.
It is the lack of maintenance acumen displayed by maintenance management that is the problem. It is the cheap at all costs attitude by Tempe that worries me. It is the out-sourcing of mx done by incompetents (non-mechanics outside the US) that worry me. It is the general attempts to cover up these things by employees (perhaps thinking, erroneously, that they are "saving the company") that really worry me.
It is the pilot who takes off with a five inch diameter unpatched hole in the intake, for Europe. Or the pilot leaving the states with an airplane showing minimum oil quantity, apparently daring the fates. The FA that refuses to have a cabin safety of flight item written up. That is what worries me.
In the military, there was such a thing as a stand down when things started to seem to get out of control. IMHO, things are, indeed, out of control at US and there is no stand down in sight. An airline does not have to "crash an airplane" to die. It could be a death by the cuts of a thousand knives, ask Lehman Bros.