If you read about MCAS, if you read about making a carrier pay a lot of money for a second $28 attitude sensor.
Redundant systems are pretty much a standard in aircraft, and it would only be natural to compare two attitude sensors against each other and fail the preflight diagnostic when the deviation was greater than X.
Anything that flies higher than 10 feet off the ground should be built by companies in search of excellence. I’m sure you can find it on the internet, but there is a video sent out by the CEO of Alaska Airlines. I attempt to read between the lines, he has lost faith in Boeing. Some suggest both the FAA and Boeing have dropped the ball, and a lot of people think they’re not picking it back up any time soon. I think selling Boeing short is going to be a popular play, I wouldn’t pick this stock back up again, people on the shop floor say it’s all about DEI.
Here’s a link to comments from Alaska Air’s CEO. https://www.youtube.com/watch?v=BPUGOFS0Dpg