In general, the benefit of encryption is 1/ defense in depth by requiring an additional secret and 2/ the reduced size of that secret you have to protect. E.g.

In general, the benefit of encryption is 1/ defense in depth by requiring an additional secret and 2/ the reduced size of that secret you have to protect. E.g. you can protect a 2GB top secret data trove with a 128-bit AES key. The same applies here, and it can be cheaper/easier/more-effective to lock an encryption key away in an enclave than the whole thing.