I agree with the library being better tested part, so that's why I think it's better to find a job that actually doesn't allow the use of libraries (or too many

I agree with the library being better tested part, so that's why I think it's better to find a job that actually doesn't allow the use of libraries (or too many of them), than to try to go to the bottom in a job that has 5 layers of abstraction. It's good to hear the literate programming thing. I sometimes do that on paper when I need to clear my mind. Basically code in English but with C type {} as scope.