That is essentially what I am doing:
I am using a smart album with the three rule (on macOS 26 Tahoe)
- The first rule (with the blank field for the name) is finding all photos with unnamed faces, but unfortunately including all photos with no faces in them all.
- The second rule is excluding all my landscape, wildlife photos etc, that I have tagged with the keyword "No_People"
- The second rule is excluding all photos with faces of strangers in them, that I want to ignore.
But there are still a few problematic cases, all photos with more than one face in them, a friend in the foreground, some strangers in the background. When I assign the keyword Strangers after naming the face of the person that needs to be named, it will never again appear in this smart album, even if the name is lost after a system upgrade, when Photos is scanning the faces again.
@Richard: I would love to have the feature back to tell photos, which detected faces I do not care about and should not be shown as unnamed. It would help a lot. I have sent feedback about this, several times since 2012, but no success so far.
I am keeping the faces circles frequently visible when working with the photos. It is the only place where I can see the name of a person. My main reason for tagging the faces with names is to be able to remember the names of the people I have met only once and where I will soon no longer remember their names when I see the photo again - distant family members that I met at family reunions only once, travel companions or people I met only occasionally at work, former students, etc. When I am seeing a group photo in Photos for Mac, it will need several clicks and round trips to the People&Pets album to see who's who in the picture, unless I write it into the caption or title, so I can see in the info "Left to right: Julian, Dick, Anne, George, Timothy". These captions help to name the faces again, when the face names vanish after an update, because the keywords with the names do not suffice to tell me the position in the photo. When I have circled all faces in a group photo I will usually take a screenshot of the named group and add it as an additional version of the photo. This way I can see the names also on my iPad and iPhone.
Apple seems to have designed the People&Pets album to create albums of people we know well and recognize them and know their name, when we see the photo. I am using the People&Pets album to look up the names of people I would not recognize again in the photo after a few years. so I have to keep precautions to save the assigned names reliably across system upgrades.