Pretty medieval, I think.

To be fair to the medievals, they did end up inventing the clock, windmills, spectacles, wheelbarrows, the longbow, astrolabes, chainmail, etc... without the help of scientists.

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.

Perhaps not, but the steam engine was invented by technologists without much input from academics and the first airplane was built at a time when many highly credentialed physicists were saying it was basically impossible. The "engineers just apply theories they get from scientists to concrete problems"-paradigm doesn't really fit the historical record. As often as not, the influence goes in the opposite direction.