Filesystem access is mostly treated by users as serialized ACID transactions on "files in directories."

"Managing this resource centrally" is where unix syscalls came from. An OS kernel can be used like a specialized library for ACID transactions on hardware singletons.

People then got fancy with virtual memory, interrupts, signals, time-slicing, re-entrancy, thread-safety, and injectivity.

It doesn’t matter, whether you call the "kernel library" from C, C++, Fortan, BASIC, Golang, bash, Rust, etc.