> High-level means not exposing hardware limitations to the application. This seems counter-intuitive. Hardware limitations mean different abstraction than OS

> High-level means not exposing hardware limitations to the application. This seems counter-intuitive. Hardware limitations mean different abstraction than OS-level APIs, as them to applications. Even POSIX does not expose hardware limitations. Rather, high-level in the paper is more like some suitable interface to a wide range of applications. I.e., high-level as it's targeted to be used directly by applications as a portable interface.