Re: the broader smart phone discussion-
It's fine if it doesn't work/doesn't make sense for you. For me, my phone is not just a way to call and text but also a personal planner, organizer, note taker, way to do banking/financial stuff on the fly, and a dozen other things I could list. Some of that stuff, I don't want any Tom, ****, or Harry accessing. It's also a way to pass time when I'm waiting. BTW, my phone is secure, but I'm not "hiding" anything-my wife in fact can access it easily(her face is programmed into FaceID) and I know her passcode. We don't go around habitually looking at each other's phones, but it sure can be handy if say one of us is driving and needs to send a text or reference something on the other's phone.
Yes, I'd much rather use a computer for a lot of tasks, but as phones get better I can do a lot more efficiently on the go. For some things, the mobile app is actually better/more functional or at least easier to use than the website.
On fingerprint-I retired my TouchID phone 2 years ago and my current one is FaceID(and with masks all the time I'd rather have Touch these days, but oh well-Face is more convenient as long as your face isn't covered). With that said, my computer can be unlocked via a TouchID sensor the same as what was used on second gen TouchID iPhones. I've had plenty of times where I've sanded off a fingerprint or ended up with a gouge in my fingertip. The latter usually doesn't stop it from working, while the former is hit or miss. On my last phone with it, and now with my computer, I have multiple fingers programmed. At least Apple devices allow that, and I'd assume most others do too.