I often have the opposite experience these days. A very (very) long time ago I knew almost everything about my computer system. I knew the physics of the transistor, the power systems, the schematic of the boards, I had practically all the source code that the machine ran and understood most of it. These days the machines are so complex that I have a very good understanding of my little corner of the machine but the rest might as well be magic for all I know about it. In a way it’s a huge victory for the engineers in our field that these things can be considered mundane.