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You don’t need splitting the private key. Bitcoin has multisig setup. For example, you can setup your wallet such that 6 out of 10 private keys need to sign in order to transfer funds. Spread that 10 private keys out. Or 3 out of 10. Or 2 out of 5. Any n out of m.

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You're right, gathering multisigs would be much safer than gathering SSS shares because you wouldn't be carrying around bits of the private key.

Any single SSS share does not disclose any additional information about the private key (i.e. it is not like splitting the key itself into parts).

And SSS also allows n out of m.

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