Declaration: I am not a pilot! (Have flown gliders only)
Having got that out of the way, I have to ask a question that has been bothering me since this issue first arose: From what I read here, the MCAS problems arise from erroneous AoA indications (plus the obvious follow ons such as the correct action to take etc). Why does the only indication of AoA have to be from a fallible instrument stuck outside on the airflow? Outside of aviation, there are many devices that can perform the same function, such as inclinometers etc, either working from a bubble indication or an object floating in a liquid. Why can a pilot not have an instrument, mounted inside the cockpit, that will give him an indication of AoA, regardless of what the airflow over an outside instrument tells him., At least, he would then have the opportunity to think about whether or not something is wrong.