This convention works for me because I'm dating slides and negatives taken by deceased relatives before I was born, mostly of children I've only known as adults. Aside from birthday parties I never know the specific day, and it's unlikely anyone in the future will really care beyond having the pictures in a reasonable overall order.

If it doesn't know the month, it puts it in June. If it doesn't know the day, it puts it on the 15th. But yeah, old photos with EXIF is more to be used by putting them in an order of photo1 comes after photo2, etc. Not necessarily photo1 is exactly 1982, etc. Viewing and enjoying old family photos is more about the order, and less about the exact year (at least for my family and friends).

The way to increase the accuracy is to add a birth year to face tagging so each photo has an anchor that the AI uses -- "This photo has joe, joe is born in 1950" and then it will look at how old joe is and if joe looks like 10 years old, it knows the photo is around 1960.

Suddenly I'm reminded of an old baby picture in an album somewhere, of me not wearing any clothes. If the other kind of "safety" scanning[1] is done, it might be possible to get arrested for a photograph of myself.

A story came out a few months ago about a guy who had a photo of his toddler's rash-affected groin area (taken at the doctor's behest) who had some essential account (Google?) permabanned because of it.