I would really recommend reading Riker’s “The Toyota Way”, it’s short but excellent read, although a bit self-congratulatory at times about the success of NUMMI.
When I think about the word “Over-engineered”, it usually refers to something like Juicero that adds unnecessary complexity to a problem solving approach, and good reliable engineering is the exact opposite of that. A minor example of that applied to a car engine is the turbocharger, it greatly enhances the efficiency of the fuel intake by forced convection, however the added complexity made it less reliable.
And the other thing to note that is that aerospace products are less reliable by necessity as their Factor of Safety never really go past 1.2 due to weight requirements, whereas you typically want the Factor of Safety of a normal design to be in the 2-3 range.