In particular, another failure where systems used random sensors. If you have critical system A using sensor A and critical system B using sensor B exclusively,

In particular, another failure where systems used random sensors. If you have critical system A using sensor A and critical system B using sensor B exclusively, great, you have now doubled the chance that a sensor failure will impact a critical system. It was even more idiotic with the MCAS system that would apparently pick a random sensor on every flight and then use that exclusively, which is of course strictly worse than just having one sensor to begin with.