My understanding is that's the info the FDC puts in the key card holder for the mobile check-in & provides the FDC w/ necessary info. It has more info on it than the card tucked into the mobile check-ins pre-Bonvoy. Not sure it's meant to be handed over to the guest, as really it's a cheat sheet for the FDC
But yeah, the more info to the FDC the better!
Cheers.