I can't even fathom this. It's so flawless for me it's almost like my iPad has no security because I never have to even think about it. With Touch ID I would get failures all the time, especially when my hands were dry in the winter.
Guess what - however strange someone else's preferences seem to you, that's the world we live in
So chalk up another person - me - who is extremely put off by Face ID... as well as Touch ID! First it's a matter of principle - my fingerprints and my face are my private biometric data, and I am not willing to use those for something as trivial as unlocking a phone/tablet/computer/device. And btw., you have legal protections if you use a passcode (as I do), which you don't if you use biometric data. Sure, I could say, I have nothing to hide, so why not - but it's the principle.
Second, and even more important - using a passcode - in my case 6 numbers - is the single most reliable way to access your device. Face ID is notorious for making mistakes - and for being a hassle, what if you decide to put on sunglasses, or what if you have changed your appearance because you came back from a dress-up make-up party, or sustained an injury, or came back from the dentist all swollen up, or sprouted facial hair, or the lighting is wrong, or a thousand other scenarios? Even if you personally have never had any problems with Face ID, the potential clearly is there - THERE IS ZERO of these issues with a passcode!!! That's a FACT. And you yourself pointed out the problems with Touch ID - dry hands in winter, cracked fingertips, smudges, injuries and so on - the potential clearly is there - THERE IS ZERO of these issues wtih a passcode!!! That's a FACT.
Let me repeat - a passcode is the single most reliable bulletproof way to access your device compared to any of these other methods, and it preserves your biometric privacy and all legal protections.
What are the downsides? For me, personally, none. It takes me probably a fraction longer to unlock my device compared to, say, Touch ID, BUT it's so fast to put in the passcode, it's a muscle memory for me. Convenience is really not a consideration for me. I do have my lock set up for 15 minutes of inactivity, though. I find I don't have to unlock all that often, making this even less of an issue.
For me, the convenience is virtually the same, but the privacy and reliability is much more important.
The reason why I wrote such a long post on this, is because I wanted to explain why it is that what may seem incomprehensible to you, is actually extremely well justified for someone else's different preference. Maybe now you can "fathom" why someone like me HATES the very idea of Face ID (and Touch ID).
That's why the whole concept of "market segments" exist. There are those like you - yes, but then there are users like me, and all of us form part of the market that a seller has to address. YMMV.