Face-name assignment in macOS Photos app is only local, not synchronized to iCloud

Apple's photo management software is a great illustration of Apple's decline. Anyway, just so you know, the assignment of Face/Pet identification to a Photo is only stored locally. It's not synchronized to iCloud. I have also read that it does not really work with storage optimized macOS Photos Libraries; the process only works on full res images (might very very slowly work, never really catches…