At the gym with your iPhone strapped to your upper arm or hip. I see numerous people doing this every trip to the gym. It will be impossible for them to unlock with FaceID unless they have "go go gadget neck".
If your phone is in one of those plastic cases which you strap to your arm, you won't be able to use Touch ID anyways, since the plastic covers the home button as well.
Seems like Face ID might actually be better here, since I can still unlock my phone even when it is covered in plastic.
In a theater when you have your phone under your coat and want to unlock it to check something by just glancing under the goat.
So why wouldn't Face ID work here? You will still have to look at the screen, right?
While in a meeting when you are wanting to be discreet and check something while holding it under the table.
Trust me, there's nothing discreet about checking your phone under the table. Your intent is as clear as day to everyone in the room; it's just whether they want to make a deal of it or not. I do it openly in my meetings and everyone's fine with it. We are all professionals here.
But my point still stands - you will be looking at the screen at some point, and Face ID will work.
At night when you want to do something with the phone laying on the nightstand without picking it up... a number of things I do with muscle memory when I'm half asleep. Holding the phone in front of your face with the bright screen would be "awakening".
You can manipulate a touchscreen device from muscle memory? Fair enough point if you actually do this on a regular basis. I don't.
Unlocking it while pulling it out of your pocket.
It's a split-second difference. I concede this one.
Paying with ApplePay "discretely". You'll now have to hold it up in front of your face to pay.
Or simply double-click the power button, authenticate with Face ID, then pay.
Why do you need to be discreet anyways?
I dunno - some of the scenarios you raised feel really forced and contrived.
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Which is why having BOTH is what they should have done. There are use cases TouchID is better and use cases FaceID is better.
Having both would defeat the whole point of Face ID - which is to provide better security, if people just opted to stick with Touch ID out of a sense of familiarity.
The right thing here would have been to depreciate Touch ID in favour of Face ID, and place the onus of adapting to it on the user.
This is how generational shifts work - first you try to force the new tool to fit the old workflow, and then the new tool creates a new workflow. Both parts are painful and full of denial, but the new model is ultimately much better than the old.