The sibling comment says it better than I ever could. It's a mechanical device exposed to 500mph wind speeds and temperatures from 40c to -50c. It's a wonder th

The sibling comment says it better than I ever could. It's a mechanical device exposed to 500mph wind speeds and temperatures from 40c to -50c. It's a wonder that they work at all. I don't think they are particularly prone to failure though. MCAS aside, having the stick shaker activate along with a host of other indications would probably be cause for a precautionary diversion by most pilots. Having no autopilot and / or an unreliable altitude would most likely disqualify the aircraft from entering RVSM airspace which is where these aircraft would normally operate.