So, here's the context for this conversation, for those joining in.
The value proposition for DIDs is that they provide stable user-controlled identifiers that can help with two main things: management of cryptographic materials, and portability of service endpoints.
With crypto material management, the idea is that a user's identifier can stay the same while underneath, keys and the like can change -- be added, rotated, revoked, and so on.
Similarly, with portability of service endpoints, the idea is that some sort of DID-based URI stays the same for a given service, and meanwhile the user can migrate from one service to another (and that stable DID-based URI for a service does not have to change).