The Kinect caused a huge wave of innovation. It was a convenient and low-cost source of RGBD data, and many robotics labs got a few when it was released.
Personally I feel FaceID is a step backwards from fingerprint readers. It doesn't work as often for me (facial hair, hat, lighting, hoodie, and sometimes it's just finnicky) and there are privacy concerns. The fingerprint reader isn't perfect, but for me it was better. I can touch it while pulling the phone out of my pocket and it's unlocked when I open it.
I'm frustrated with Google's choice to copy Apple and remove this feature from the Pixel 4. It's literally the only reason I'm not buying one.
I guess it depends on whether or not you consider a 3D scan of your face personal data. As face-tracking becomes more prevalent, I'd say this is the worst thing you could voluntarily give away. Your face can be scanned just walking through a crowd in public, a fingerprint is only usable when you physically touch something (and the digital version is always prompted so you can't be identified in a crowd unexpectedly like you can with a face).
I would agree facial recognition in a general sense has privacy implications — but in the case of Face ID I think the implementation is sufficiently secure.