Apple Watch is just extension of screen and notifications from the phone, so there is no overlap.
AirTags have nothing to do with AI stuff.
AirPods apparently now have some translation stuff, but again no constant monitoring.
Apple does not produce glasses and seeing the backlash to Meta's glasses I don't think they will. A pin or pendant might be more acceptable, although hiding it will be just as big of an issue as with the creepy Meta glasses, but any AI thing Apple makes should be a separate product if they want to maximize profits.