It is not good for recovering lost follows because it only offers a way to restore a previous follow list, not to grab people back from that.
Interesting. It never occurred to me that you wouldnt just restore the latest version that was on record and rebuild from there. Is it because you didn't realise it was lost until you added some more people?
Maybe we need a relay that trawls all other relays for everyone's follow list and stores all versions. They could then charge sats for recovery.