I disagree. Knowing how memory works, how a CPU works, what Multi-Processing is, etc. are all pretty vital in being a decent programmer - yes, even for the web:

I disagree. Knowing how memory works, how a CPU works, what Multi-Processing is, etc. are all pretty vital in being a decent programmer - yes, even for the web: if you don't know that Javascript contexts run single threaded (in the UI thread) then you run the risk of writing hugely unperformant code.