Splitting seed phrases defeats the security.

Instead, upgrade to 2-of-3 multisig.

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I think he's possibly describing shamir secret sharing. I agree its inferior to a proper 2-of-3 multisig as it requires components to be in the same physical location to gets single private key to use for signing. Shamir for wallets offers all the complexity and risks of multisig with none of the benefits

Correct