Boeing and the FAA need to identify the engineer(s) who implemented and management who signed-off on such a blatant violation of design standards - and logic.

Whoever ignored that redundancy is requisite to automated systems relying on mechanical sensor data - he or she does not deserve to be an engineer. How many hundreds, thousands, billions of such electro-mechanical links (or programming in logic circuitry) exist in aerospace engineering?

NO excuse - this is just plain stupidity.