Big +1. Face ID fails way more than Touch ID ever did. I know you couldn't your finger with wet hands or gloves, but that didn't come up all that much.
Face ID fails multiple times per day, every day. I can't unlock my phone well in bed, while brushing teeth, while it's sitting on a table not directly in front of me, if I'm in direct sunlight, in a car mount, etc. The only time it's more useful is when I'm already using the phone and need to auth for an app (bank, 1Password, etc). Then it's seamless. It just doesn't make sense as an unlock mechanism, IMO. iPad has the same problem - I can't unlock it if it's on the couch next to me without picking it up and holding it in front of my face.
Face ID would make a lot of sense on a laptop, which is always used in basically ideal conditions for unlocking: straight on view, probably inside, always centered on my face.
I'd love Touch ID on a phone's lock button, but that's not an option. And I'm worried that if it was an option, it would be relegated to the budget phones (like it is on ipads).