No, it isn't. Shamir's is poorly implemented and has a number of problems which makes it a bad solution, as detailed
here and
here. A better solution is to either use one or more complex passphrases, or use multi-sig.
This is better than Multi-Sig, because you don't need every seed's master public key.
Which is a trivial problem to overcome in an
m-of-
n multi-sig simply by backing up
n minus
m of the other master public keys along with each seed phrase/master private key. Plus multi-sig brings all the advantages of a standard implementation with no single point of failure.