Your computer is a desk weight without the (or an) OS and software that runs on it. Each os/or software package down to libraries make trade offs that restrict their usage from general purpose to a specific set of functionality. It is impossible to write a line of functioning code without constraining the concept of "general purposes" as you have implied above -- each line of code does "something" not "Everything" by its very nature.
Your computer is a desk weight without the (or an) OS and software that runs on it. Each os/or software package down to libraries make trade offs that restrict their usage from general purpose to a specific set of functionality. It is impossible to write a line of functioning code without constraining the concept of "general purposes" as you have implied above -- each line of code does "something" not "Everything" by its very nature.