That's for sure about 'engineers'. I have worked with some who have NEVER touched anything they were associated with and when they did they were at a total loss and relied on the mech/techs to tell them what they were looking at. They can do a lot on paper but not so much on real things. Had 1 work for over 2 years on a valve angle/pushrod problem that really didn't exist, and his solution caused more issues than had been before. Actual problem was preignition causing rods to go out the side of the engine! So much for engineers and knowledge!