Ideally, you connect Vault to a HSM if you need that kind of security that’s being described. HSMs are electronic safes
The website says "10 minutes against forced entry". That's not safe.
No safe is safe against a state level actor. No safe is safe against "hit you with a crowbar until you open the safe".
Whatever secrets you have, it's better to hide them than to put them in such a conspicuous place. The only reason one should use a safe is as a plausible decoy...
If you have state level actors physically breaking into your facilities then we might be at war
I am referring to Shamir algorithm that Vault uses
By geographically distributing your signing devices you improve both security and reliability. One of those keys can be hosted by a third party to be used for recovery, without providing them any ability to touch your funds without your involvement.