It would be useful to have an authentification system that can be linked to people.
This could possibly allow us to link any form of authentification (NFC, Pin Code, Fingerprint or Face) to certain users and be able to set limits for those users only (certain Door Locks, etc)
It would also be nice to be able to store these attached to users so someones Face or Fingerprint can be identified on a variety of devices/ authentificated on HA itself with the devices only sending the data (picture of face, picture/data of fingerprint)