TouchID was only usable with one finger. If you were right handed you would normally use your right thumb. Problem was you couldn't use your left hand for TouchID. I'm right handed and I keep my phone in my left pocket. Whenever I'm sitting down (dinner, meeting, etc) I always pulled out my iPhone with my left hand and typed in the code. Since getting the X I found it amazingly nice that all I need to do is look at the phone. It unlocks with both hands without the code. In many regards I prefer the TouchID, but in this case it's a nice feature and issue FaceID fixed that TouchID could not. Now, you can unlock the phone with both hands. PS: I'll add another advantage. Before you would have to adjust your hand so your thumb could press the button in the correct angle to use TouchID for purchases or downloads. Now, you just look at your phone. Faster and no need to adjust the hand.