Right, similar experience here, and that's exactly what I mean. For example, I don't think a typical fullstack dev would know what it means to see a 'too many

Right, similar experience here, and that's exactly what I mean. For example, I don't think a typical fullstack dev would know what it means to see a 'too many open files', how to debug, or how to fix. Hell, most don't understand the difference between a 'connection refused' and a 'unknown host.' In fairness, they don't have to. I started as a full Linux/C nerd who thought I'd conquer the world, and watched as tools like Docker attempt to make it irrelevant. I say attempt because I find it typically a huge waste of resources as an abstraction, but people love it, so I lost. I don't feel defeated or obsolete, just the nature of an ever evolving curriculum I guess.