Are JBOK wallets used in any respect?
All pockets software program that I do know of has migrated from JBOK to some type of deterministically derived keys. The primary pockets with deterministic key derivation that I do know was Armory round 2011-2012, and its scheme impressed BIP32, which fashioned the premise of many key technology requirements that adopted. Clearly, software program that predates these schemes did use JBOK (particularly, the Bitcoin reference software program did, earlier than it was known as Bitcoin Core). Nowadays Bitcoin Core nonetheless helps JBOK wallets (e.g. should you load a pockets created by an outdated model), however new wallets by default are BIP32 primarily based.
So far as benefits goes, I do know of 1: JBOK wallets “unsteal” themselves over time. If somebody finds your pockets file with keys, they’ve entry to your present funds, and plenty of future keys which can be usually included within the backup. However over time, as you create extra obtain addresses and transact, shifting outdated cash to new change addresses, these cash turn out to be out of attain for an attacker.
It is a small benefit solely, and presumably not thought of essential sufficient to weight up towards some great benefits of simpler backups.