[...] TouchId is outdated technology and the vast majority of its advocates are people who have never tried Faceid, which is a far more secure, elegant, modern, natural and generally better solution
Ha! I've not only tried it but I'd tried to like it.
Face ID: Fail.
I'd hardly call Face ID a "Fail"...but Touch ID was and is perfect both in reliability and in user interaction. Face ID did not maintain that perfection. I've found both Touch ID and Face ID to be reliable at what they do, but Touch ID has more things it does a little better, in terms of user interaction. What do we ask each of them to do?
UNLOCKING THE PHONE
Touch ID: Place thumb on home button (can do that without looking). Press (or raise) to wake, leave thumb where it is, and you're at the home screen.
Face ID: Touch screen or raise to wake. Ensure Face ID sees your face, which is not difficult but not automatic; while the True Depth camera does have a very wide field of view, it is not 360 degrees. Then swipe up from the bottom to get to the home screen.
This is one of the two places where Face ID falls significantly short of Touch ID. You might consider the Touch ID interaction to be two steps (press button, hold thumb on button) but in practice they are essentially one step, as you do not have to move your thumb. And you could have the home screen up before you even set eyes on the phone.
IN-APP AUTHENTICATION
Touch ID: Place thumb on home button.
Face ID: Nothing
Here is where Face ID shines. It's very likely that I'm already looking at the phone when it comes to simple authentication within an app. I don't have to do anything. There are some apps that won't do Face ID automatically, they require you to tap somewhere to confirm you would like to use Face ID each time; the same is true for Touch ID, however.
APPLE PAY
Touch ID: Place phone near reader. Rest thumb on home button.
Face ID: Double-press side button. Ensure Face ID sees your face. Place phone near reader.
This is another place where Touch ID is just better. The process is fluid. Just the act of pulling the phone out of my pocket already puts my in a physical position to do the job. I do look at the screen to monitor progress, but I have to do the same with Face ID, to make sure the transaction goes through. This whole process is still in place for using Apple Pay within an app: I still have to double-press the side button. Again, with Touch ID, the standard hold already has me in position to authenticate. I find it clumsy on Face ID. I not only have to get used to new holding position but also a new set of muscle CONTRACTION: I need to not only touch the side button but double-press it.
GOING TO HOME SCREEN
Touch ID (home button): Press home button.
Face ID (gesture): Swipe up from bottom of screen.
This isn't a comparison of Touch ID to Face ID, but it is a comparison of home button to gesture interface. The home button is a physical target, and again, it's in a location where your thumb just could rest normally, without stretching or reaching: it's not only the phone's home button, but it is essentially your thumb's "home location." It's a place it naturally goes.
The swipe up from the bottom of the screen has an advantage in that it's a big target (I can swipe up from any part of the lower edge), but it's a place I have to reach for. Now, I'm generally a two-handed user, I always have been. At least half the time I am going to swipe up with my opposite finger. But with the home button I never ever have to use the other hand. It's just right there.
ACCESSING THE APP SWITCHER
Touch ID (home button): Double-press the home button
Face ID (gesture): Swipe up from the bottom of the screen, with a brief pause at the end
This has the same dynamics as just going to the home screen, BUT I often accidentally reach the app switcher when I intend to go home on my Face ID phone. As my muscle memory improves it's getting better, but it still happens a lot. It's not a tragedy but it is frustrating. To be fair once in a while I would double-press the home button too rapidly and I would get to the home screen, but that happened WAY less.
And what's more, because the two natural swipes from the bottom are taken (swipe, and swipe-and-pause), that meant that the previous result of that gesture (accessing the control panel) had to be moved; now there are two swipes from the top that achieve different things based on where you swipe. That's a downgrade. Swiping from the bottom for control panel and from the top for notifications was easier, without thinking.
I understand that Face ID makes possible the full-screen experience. I'm on a 13 mini, so the screen isn't all that much bigger; I imagine that the extra real estate is much more noticeable on the larger phones. And it's also fair to suggest that this is a matter of muscle memory. But I never had to worry about muscle memory with Touch ID. It was natural, it worked with how my hand wanted to work the very first time I held an iPhone, way back in 2008.
You may like the edge-to-edge screen a lot and I wouldn't dream of telling you you're wrong. But we had to throw away things that worked to get it, and replace them with things that work, but less well.
Besides just the wonderful experience of first interacting with an iPhone at all, there have been two experiences that just knocked my socks off in the history of the iPhone. One was the jump to a retina display on the iPhone 4. The difference was so drastic, so amazing, that the very next moment when I looked at my 3GS, the screen was garbage. It's truly the only time I've felt that way about older tech. In an instant, it was insufficient.
The second was Touch ID. It was and is brilliant. It added biometric authentication, and shortly thereafter phone-based payment, without asking me do to anything different than I was already doing.