Today that type of concern would seem absurd, and we've gotten used to the idea that flying a plane and building it are separate skillsets and jobs. After all, we are comfortable with aviation engineers designing the aircraft without knowing how to mine the bauxite, smelt it to aluminium, and machine it into aircraft parts.
As comforting as it is to have an overview of how to trace a complete path from logic gate to web request, it isn't necessary. The decrease in the number of engineers with that overview isn't a cause for alarm, or a problem to be solved. It is just a sign that "tech" has matured, and it is stratifying into a set of interlocking disciplines. The same happened with every other subject in human history, and we've been just fine...