Three things to consider.

For about 2 years the Max 8 flew about 7,500 flights per week without serious malfunctions, only a few MCAS nose down problems that the pilots could remedy.

Why did one angle-of attack sensor on the Ethiopian plane measure a reading of about 74% which is wrong by about 60%?

Why did the plane increase thrust/speed throughout the 6 minutes of flight when throttle settings were reported (as of today) to have remained unchanged?

Something is missing in story, imho.