8 years ago, An Airbus crashed due to a blocked' AOA sensor- which fooled both the pilots AND HALBUS .
So a few years later during gestation-certification of MAX, Boeing played word games re critical definitions in how failures affect safety of flight- which allowed a single point ' failure' to take control from pilot ( for the first time ever ? ) and then decdided to not notify anyone via some oversight or creative pencil whipping
https://news.aviation-safety.net/201...-check-flight/
Report: blocked AOA sensors caused loss of control during A320 check flight
note this was with experienced pilots !!