If I read that Vanity Fair article correctly, it suggested that at certain points the EFIS did not display correct values because the jet's pitch, and/or roll exceeded what it could measure.
I had assumed that like a fast jet panel, an airliner EFIS would display values even if they were way outside the recommended operating envelope.
So if you are 60 degrees nose up (extremely high alpha) will the EFIS in an airliner simply peg out at around 40 degrees nose up?
If - apologies to Tex Johnson - you flew a barrel roll in an A320 for example, or were able to fly a loop would the EFIS display flip and display inverted pitch or roll values as it does in a jet fighter, or is it simply not programmed to do this, because it's not expected, and therefore would be an unnecessary complication/and or cost to add?