It has though. There have been several articles about reports filed by pilot's where uncommanded nose down occurred, that the root cause was not ascertained for. This is reported at a minimum here.
These are by definition "typical flights" until the anomaly occurs.
Also, keep in mind, AoA sensors have long been a luxury for pilots, since they tend to learn the envelope in terms of glide slope, and they are trained to be able to safely operate aircraft without it.
The MAX took a historically non-critical component, and added it to a safety critical process.
I understand that with the sheer number of different points in the timeline of the design, deployment, and operation of these craft, that trying to hold all the context in your head at the same time does make it feel like
"Damnit Jim, we've entered crackpot territory!"
Nevertheless, we have to remain vigilant and open to the fact that malfeasance does happen, and those that would commit it also go out of their way to make it as hard to bring into the open (if intentional), or frequently disincentivize any activity that could potentially make the issue easier to observe since the path of least resistance typically by definition involves minimizing points of inspection or other forms of scrutiny (if the malfeasance is merely the result unintentional misguidedness/incompetence).
https://theatlantic.com/article/584791/
These are by definition "typical flights" until the anomaly occurs.
Also, keep in mind, AoA sensors have long been a luxury for pilots, since they tend to learn the envelope in terms of glide slope, and they are trained to be able to safely operate aircraft without it.
The MAX took a historically non-critical component, and added it to a safety critical process.
I understand that with the sheer number of different points in the timeline of the design, deployment, and operation of these craft, that trying to hold all the context in your head at the same time does make it feel like
"Damnit Jim, we've entered crackpot territory!"
Nevertheless, we have to remain vigilant and open to the fact that malfeasance does happen, and those that would commit it also go out of their way to make it as hard to bring into the open (if intentional), or frequently disincentivize any activity that could potentially make the issue easier to observe since the path of least resistance typically by definition involves minimizing points of inspection or other forms of scrutiny (if the malfeasance is merely the result unintentional misguidedness/incompetence).