There seems to be confusion on how this works and I'm getting PM's from another user determined to argue that this interaction is somehow worse, even though it is provably not. Different, yes. Worse, no. Let's cover each scenario, touch-id, no touch-id and raise to wake (which implies Touch ID)
Non-touch id users: -
iOS9: -
1) press home or power for lock screen
2) slide to unlock
3) enter pin if necessary
iOS10: -
1) Press home or power for lock screen
2) Press home to unlock
3) enter pin if necessary
3 steps in each case. No extra interaction, just a button touch replaces a swipe. Arguably actually better but definitely not worse.
Touch-id users who either don't have or chose not to use raise to wake to wake the screen: -
iOS9: -
1) press home (quickly, lest it unlock) or power for lock screen
2) Place finger on Touch ID to unlock (no need to press button)
iOS10: -
1) Press home (quickly, lest it unlock) or power for lock screen
2) Place finger on Touch ID to unlock (no need to press button)
Two steps before. Two steps after. No button presses are required. Exactly the same workflow.
Raise to wake: -
iOS9: Does not exist on ios9
iOS10: -
1) Raise to wake
2) Place finger on Touch ID and push button
This method allows you to safely view the lock screen without the Touch ID kicking in too soon. It requires precisely the same number of button presses as the 2nd scenario but avoids accidental unlock.
This is how it works and there is nothing to argue about. No-one is hurt by this but the terminally unadaptable.
Correction/addendum: If you're just unlocking the above is how it works. If you're on the lock screen for more than a few seconds in that scenario 2 (Touch-id users who either don't have or chose not to use raise to wake to wake the screen) you do indeed have to press home too. Still the same number of steps.