You're arguing from two different perspectives. Engineering is about producing an deliverables that just meet spec. If someone orders a temperature sensor that they ask to be 1° accurate then you are wasting your time designing something better^.

However the engineers in question at Boeing clearly failed to produce a design that performed to spec in normal operating conditions.

^ Yes, there are scaling factors where it might be cheaper to design a 0.1° accurate sensor and sell it to everyone because it would be more effort having two production lines but that's an optimization.