On a system where /usr/bin/fetch is hosed or missing, a /rescue/fetch could be incredibly handy to grab distribution set or cherry-pick single libs/binaries as needed to recover the system.
Obviously one may need to slap a --no-verify-peer or find an HTTP alternative depending on the level of destruction that's occurred, but this is much better than wasting time on reboots and more complete rescue media if one already knows what to fetch for recovery.
This adds about 500K to /rescue/rescue, but I think the tradeoff is worth it.