you'd be surprised how many professional programmers these days work exclusively in high level languages and know nothing about using operating system features

you'd be surprised how many professional programmers these days work exclusively in high level languages and know nothing about using operating system features to their fullest. but to your point, until technology itself actually replaces us, deeply skilled computer people are always going to be able to squeeze more performance out of software implemented in high level languages by those who have not studied computers extensively.