FaceID is better than front or in-screen fingerprint readers but I greatly prefer fingerprint readers on the back of the phone. It's right where your finger naturally rests when taking the phone out of your pocket so the phone is unlocked before it even leaves your pocket. Plus you can pull down the notification bar with it one-handed without having to awkwardly stretch to reach it on large devices.
Interesting enough I actually agree in principle with arsenico and ken. The debug button example is a weird corner case. On pretty much every smart phone you click a green call button to make a call and click a red disconnect button to disconnect. The debug button is consistent with other toggle buttons while being the reverse of a common convention. It may have been less confusing if it was a grayed out phone when off and green when connected.
The most confusing toggle I've seen is the "Listen for debug connections" in intellij [0,1]. It shows the current status instead of the action you would be performing. You have to click the "Hang up" icon[0] to START listening and and "Connect" icon[1] to STOP listening.
In their defense that's how most UI toggles[2] work but they are using a 'phone' metaphor and it's implemented backwards from how you would usually expect a phone call UI to work.
