>I can unlock my phone with my fingerprint while pulling it out of my pocket

This, I can do it without thinking.

The iPhone 11 has the second generation FaceID sensors which is much faster and has lower error rates (to the point that it's not very noticeable anymore). Also, while you do "lose" the TouchID sensor, all FaceID-equipped iPhones have tap to wake and raise to wake functionality which is much more useful than being able to unlock my phone in my pocket, IMO.

Raise to wake is available on older non-FaceID phones. I think this feature was enabled by the M7 motion coprocessor chip https://en.wikipedia.org/wiki/Apple_motion_coprocessors which first showed up in the iPhone 6.

Very cool, I did not know that.

> ... than being able to unlock my phone in my pocket...

I see what you did there. But that's not what OP said.

This is exactly why I bought an iPhone 8 earlier this year. The fingerprint reader combined with rest to open means my phone is ready to go before my eyes/face are anywhere near the screen. There simply is no competition (against face id) as far as speed is concerned.

This might be a dumb question, but how does Face ID work with beards and other facial hair?

As far as I understand FaceID makes a "map" of your face using a series of sensors (including IR) that is then compared against with when unlocking the phone or using a FaceID compatible login in an app. The beard/facial hair is part of that map, and the way Apple designed FaceID is to learn details that slightly change over time like a beard growing. It does (from experience) fail if the change is drastic, such as shaving a long beard or being in direct sunlight when you haven't been in a long time, but you can then enter the PIN/password and it will learn the "new map data" of your face and will work during subsequent tries. I would guess it does somehow combine old and new data when you enter a PIN and update the map, as it doesn't get tripped up if you, for example, unlock your phone in direct sunlight and then unlock in lower light shortly after, but I can't be certain.

Would giving my pin to someone with a very similar face mean that over time my phone would start to map their face as mine?

I would guess that it would only add to the model if the new face is recognized by the existing model.