I’m not sure splitting a recovery seed is much of an upgrade from single-sig - at least not in the way multisig is. It’s definitely better than keeping your private key sitting in one place, like your sock drawer, but if your Bitcoin is still secured by a single signature, then someone with a gun can still coerce you to unlock your hardware wallet.

The real advantage of a 2-of-3 multisig setup is that there’s never enough information to spend the Bitcoin in any one location. No single compromise gives an attacker control - and that’s a true security upgrade.