Is a non removable TPM actually the right level of security? It feels like the same level of security I would get by having one of those realtor lock boxes per

Is a non removable TPM actually the right level of security? It feels like the same level of security I would get by having one of those realtor lock boxes permanently affixed to my front door and always keeping my house key in it. Maybe the key itself is "more secure" because it only lives in the lockbox and is only taken out to unlock the front door and then put back right away. Is this the right system for actually securing access to my home, though?