It's actually trivially possible but the entropy for each shard will be abysmally low, requiring very long (60 words+) passphrases. So you're right, there's no

It's actually trivially possible but the entropy for each shard will be abysmally low, requiring very long (60 words+) passphrases. So you're right, there's no trivial way (by hand) to split a 24 passphrase in 5 shards. However, it feels like a detail: such sharding is possible even if it's not trivial: https://iancoleman.io/slip39/ https://iancoleman.io/slip39/