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"But muh hardware wallet..." ...stores your full BIP39 seed, in a secure element (if that), and typically only adds ~30 bits additional entropy in the form of a PIN, which is easily brute forced if you can extract the seed.
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It's why 24 word seeds are useful to split them into 3 parts where 2/3 parts are required. Having the whole seed phrase stored in a couple places is quite a weak point even if well hidden. I'm sure more people lose funds from losing the seed phrase or it being damaged though.
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These are really nice: cryptosteel.com/product/crypto I wish they'd had that years ago because it's nicer than their older cassette approach. They have them in packs largely for splitting seeds. SLIP39 is the Shamir's Secret Sharing version of BIP39: github.com/satoshilabs/sl