Comment by dspillett

> I wonder how they use these feeds if that's only internal.

Perhaps they don't, it could be that the interface was written to a more flexible spec to allow for ongoing changes, and close to release they decided which features would be officially supported. In that case the method being used here is either deliberately kept around for potential future use, or is a bit of their tech debt.

It may also be something that is internally supported still because it is used in legacy apps that are still out there (some smart TVs have ancient apps and no upgrade path) but they don't want it used by new code as it will eventuality be removed.

In any of those cases, there is no guarantee it'll still be there tomorrow.