I hear you. There was a time when I could pretty much describe everything that happened from the time you pressed a key to the time a file was displayed on your screen: exception/interrupt handlers, keyboard driver, network stack, storage stack, context switches, page faults, etc. And that was a pretty good chunk of what I needed to know in order to do many useful things. Now some of those pieces aren't even relevant any more, the others have all become far more complex, and new ones keep being added at an ever increasing pace. Nobody but nobody can know such a high percentage of what's going on as many of us once did. I'm not saying it was better, but I do miss it.