The explanation is simple: 

Bernoulli's law is learned only in an advanced aerodynamic course, a mandatory part of an aeronautical B.Sc engineering degree.

 

Other fields of engineering usually don't study and exploring the field of aerodynamics. Thus, 99.9%

of Mechanical engineers working in the industries are not aware of Bernoulli's energy conservation law. 

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As for aeronautical engineers, those who are aware of Bernoulli's law are trained to implement this

energy conversion as a process taking place in extremely hot gases, as it is done in aircraft jet engine or power stations turbines but not for atmospheric air, which is much colder than hot gas.

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"The solutions all are simple - after you have arrived at them.
But they're simple only when you know already what they are."

Robert M. Pirsig
Zen and the art of motorcycle maintenance