I know, UEFI Shell exists and feels alright, but how about making another simple Disk Operating System i do not mean DOS haha for simple disk management?
But to the point: why?
If you want to install macOS on PC, or some other OS and you're just bored of turning PC off, then back on, edit file, next off again doesn't work, on again blah blah blah, the Inside is made especially for You.