I can see it as a help for sports photographers where you can have whole teams and then create the tags inside once.
Good luck with facial recognition, I tried it when it came out and ended up just giving up. It has way too many false positives (identifies person X as person Y) and negatives (fails to see a face at all). And once it has run on a photo it's just done with it, there's no way to go back (let's say if they improve the algorithm) and have it redo it again for that photo.
The killer for me was the false negatives -- where it just completely skipped photos entirely, so there's no real opportunity to go in and fix it (yes, you can go back and manually mark and tag faces but only if you realize it skipped photos).
Adobe did this and got it out fast for the "me too" factor, but I have yet to find anyone that really got into using it for any volume of work and kept with it. Maybe you'll be the one, but...
And as far as I know it's never been improved since release, which for a V1 product tells you they either got it perfect, or just lost interest. I know where my money is.