Do aircrew actually need to know the in-depth technical aspects of an engine? I'd have thought that the basics were sufficient; what's the point of a pilot needing to understand the construction/operation of an engine-driven hydraulic pump, for example, when a cockpit doll's-eye indication is the only thing that he/she needs to know about a u/s system. There's nothing they can do about it in flight except for using alternate procedures. Same with materials and design technology. Airlines and manufacturers have decided that the flight engineer is redundant!
Anyway, how many of us take kindly to being told by a pilot exactly where a problem lies instead of being given the symptoms and letting
us diagnose the fault.
The language difference probably accounts for shortcomings: it's the same where I work.