Thinking out loud:

Since handles refer to offer rather than absolute addresses, this sort of scheme should allow for "serializing" data by memmapping chunks of memory to disk.

Obviously, this scheme wouldn't be useful for cross-platform save files, and might not even translate across builds.

Still, as long as you have a robust scheme for invalidating data when a new version is deployed, I could see this being useful for caching, and for saving state for short periods of time on mobile platforms that like to restart processes with little warning. (Rather than potentially losing your place within the game level any time you switch between apps, you only lose your place within the game level when an app update gets installed.)