Because the words are the wallet, how they are recorded and stored is the whole security question. A photograph in cloud storage, a note in a password manager or a text message to a spouse all convert a hardware-secured wallet into a digital secret that can be copied silently.
Durable backups are physical, redundant and geographically separated - and in multisig, no single backup location holds enough material to spend. That distinction matters: in single-sig, one found backup drains the wallet; in a well-designed 2-of-3, it does not.
For estates, seed backups should never be handed around informally. The right pattern is a documented protocol: where material exists, who can access it, under what conditions, and what steps an executor follows.