The problem with statistics of small numbers of events is that probabilities based on them have huge problems determining the confidence interval.
It's better to focus on the sequence that led to the accident and identify any places where the same initiator might start onto a different path. Like, before MCAS was involved, why did the last crew do exactly all the opposite things in response to a simple stall warning? Nice day, plenty of visibility, engines running fine. Set pitch and power and go on with the day. Or just concentrate on the autopilot to the exclusion of lowering the thrust until Vmo is exceeded?
What fault in the training allowed the crew the understanding that only autopilot could possibly be the answer to a problem that demanded autopilot be given no authority?
No point on continuing worry over MCAS as that software has been altered to perform a different function, but this won't be the last stall warning a crew gets on an airplane.