I'm probably the only person who watch the mini documentary Embark: https://www.ncl.com/embark-series
At the end of the second episode for about half a second they showed facial recognition. Whether that's just to identify you when wearing a mask OR for other purposes, I'm not sure.
I think of maybe 4-5 areas which require some form of identification usually via room key with your photo on it (newer ships have NFC chips that are used to debark/embark). Maybe you can use your face to charge one of these days soon?