I don't see why engineers would discover and develop electricity, to start with, never mind all the complicated stuff like transistors and GPS and such.
Oskar Heil was an electrical engineers and at the same time one of the first people to get a patent for a transistor design.
Science is not particularly reliable.
And yet, we have remarkable technology, and can do medical marvels.
My tentative theory is that there's a lot of knowledge that's less formal than science in engineering, manufacturing, and the practice of medicine which makes it possible to get work done, and some fairly effective methods of filtering information that comes from science.