Fair point, I elaborated what I mean here https://news.ycombinator.com/item?id=45116976

To address your specific point in the same way: When we're talking about programmers using abstractions, we're usually not talking about the programming language their using, we're talking about the UI framework, networking libraries, etc... they're using. Those are the APIs their calling with their code, and those are all abstractions that are all implemented at (roughly) the same level of abstraction as the programmer's day-to-day work. I'd expect a programmer to be able to re-implement those if necessary.