A large portion of engineers and pure science majors can’t communicate normally. They need continuous structured language teaching to convey information to another person.
Most people do not understand this. One of my first jobs was doing "Engineese to Construction worker" translations.
Tell me about it! I have a cousin, an extremely respected science prof at Wellsley...Hillary’s alma mater. He dare not even look one of his female students in the eye, for fear of having harassment charges brought up! So, he gets through the day, eyes downcast, and endures it for the great pay and benefits. Then he hurries home to his adoring wife and daughters, for sanctuary from the harridans of the modern university!
Aside from the obvious "broad brush" nature of that statement, I think it's a serious error to lump engineers with pure science majors. They need not be mutually exclusive when it comes to communication, as Richard Feynman demonstrated.
I suppose the clearest way to define the difference is to remind everyone that the pure science communicator most commonly is incomprehensible, and thus irrelevant, to the average person: e.g. Stephen Hawking.
Less known engineers in the practical application area, must communicate clearly, can't fake science, because for them, failure to communicate clearly usually means loss of life, occasionally spectacularly.