Same here, the fingerprint scanner is one of my favorite features on a smartphone. It's so much easier to unlock a phone that way. If Samsung ever removes it in their future phones, I'd be super upset.
Facial recognition just doesn't seem as quick and reliable as a fingerprint scanner. Even in Apple's keynote their Face ID embarrassingly failed...
https://www.youtube.com/watch?v=m7xmCCTVS7Q
One of my concerns about Face ID is with the car drivers. I know many people still use their phones while driving, which is unfortunate but true. My concern with those people is when they try to unlock their phone using Face ID while driving, because they either need to look down at their phone to scan their face or put the phone in front of their face, blocking their view of the road. I just feel this feature will cause a lot more car accidents.