From the Bright.nl exclusive interview:

Schiller has a quick answer to the commentary that other smartphone makers had a face or iris recognition before Apple did: “They all stink.”

He nuances: “They don’t work in all the ways we need Face ID to work. We’re very aware that through the years this simple thing, the Home button, that started as the way you click to get to the Home screen, grew into doing so many things for us. We added Touch ID, it took you to the multitasking screen, paged Siri, activated Apple Pay. All through this one mechanical button.

So for Face ID we needed the best way we know of to enable us to easily unlock our device with our face, in a protected way with the Secure Enclave, and support all these other things. We had to solve all of that. Other things that people have tried with face haven’t been anything like that. Face ID is a very unique implementation.”

And:

“I think we’ve worked really hard to maintain the trust we have with users about how this information technology is and isn’t used. First of all, no Face ID data goes to third parties. So what you enroll with Face ID, what you use to unlock your phone, that’s an algorithm that is created and encrypted by the Secure Enclave. No third party that uses the iPhone camera has your Face ID data. We did create an API so developers can use the cameras to track facial movements, to do things like wrap stickers on your face (like Snapchat, ed.) That’s different than Face ID. They don’t have all the access to the data that Face ID has for that.

And:

“We feel bad we aren’t able to deliver Homepod for the holidays. We’re going to take the time to do it right and make sure it’s great when it comes out. We need more time to make it right.”

There’s a lot more. I found the whole thing worth reading.