> The reason people use systems programming languages is because they need to efficiently and effectively manage and manipulate memory.

That's not true. Assembler and machine code predate C. And do the job much more effectively/efficiently.

For example Menuet OS an OS in pure assembly has like 2MiB and has stuff like GUI, graphics, etc. What Linux does in hundreds of MiB.

But they need to rewrite it for each hardware platform.