IOS – How to sync the new “people” (face recognition) metadata across devices in Photos (iOS 10 and MacOS Sierra)

The new Photos updates for iOS 10 and MacOS Sierra includes a much more powerful and integrated approach to organizing photos by who's in them. It's built around powerful, on-device facial recognition.

But once it does its automated thing (finding the faces it thinks are the same person), there's still a lot of manual merging and labeling to be done if you have a lot of photos and are as obsessive about organization as I am.

For example, if you have, say… three thousand photos of your daughter, Photos will find almost all of them, but may guess they're 5 or 6 different people. So you have to merge the buckets that all are one person, assign them a name (so you can search by it), etc.

But unlike other changes (edits, deletions, organization into albums, etc.), manual changes to "people" data don't seem to sync at all by default.

Is there really no way to do this? It seems bizarre that one of the flagship features Apple's touting in this Photos update doesn't play at all with what was Photos primary selling point over iPhoto – everything synced on all your devices.