It's selectivity was decent if you used just one finger, but decreased with enrolling multiple fingers. It was sensitive to skin oils building up, sensitive to sweat and moisture, and doesn't work with gloves.
FaceID improves upon all of that and permits apple to removie the button and giant borders everyone has griped about for years.
FaceID imrpoved on a number of things users said they didn't like. I'm not sure why people have a hard time accepting such.
I really do like the Fingerprint scanner, but all the things you listed were exactly right. The wetness and gloves were the biggest ones.