SCRT labs is actively researching for ways to add features of HME and sMPC into the Secret Network protocol. The team is very familiar with these methods but sees no way to offer a scalable fully software based blockchain encryption protocol at this moment in time. Further research on HME might one day make it reasonably fast for Generalized compute but at this moment in time that is not feasible.
The team is however looking into deploying logiv for threshold signing or MPC as an additional security metric for Secret Contracts. With this infrastructure contract developers might choose to add this secondary layer (on top of SGX) of privacy to further protect the most sensitive content.
A good use case for this is further protecting private or encryption keys that are hosted on Secret Network. Jackal, AlterDapp, Serenity and more applications all use private on-chain storage for private keys in this way. These keys don't have to be accessed often and are a very small size, the scalability concerns of MPC are therefore less important.
Combining SGX and Software based encryption in this way allows for a very composable infrastructure providing privacy at different security levels and scalability.