vovachan
What you are referring to is what's known as "Anomalous design".
It is AB's strong suit, and if as you say, some of the mechanicals had undergone the same approach, AF447 would not have happened.
Likewise, BA038 would not have happened, they would have landed safely with one Engine.
It''s a long story, and unknown why it hasn't been discussed before this.
Three separate software systems, but identical pitots ??