Purpose of / (Score 3, Interesting)

I thought *nix was designed as:

/ - minimum required to boot and repair system

/usr - other binaries included on default distro

/usr/local or /opt - packages added above and beyond the distro

If your system ever became damaged, you booted to / and fixed it. If / is too large, then audit what's in there and make sure it contains the bare minimum required.

Adding /rescue is unnecessarily cluttering up the system.