Like smartphones with an entire interface focused on multitouch. There wasn’t another one of those “proven in the market” before the iPhone.
Or, you know, the first mass-marketed personal computer with a GUI, and the first successful one with a mouse (Lisa, Mac).
The Kinect example is nonsensical, it wasn’t as an authentication device. Even if they used the same team and technology, so much more went into it (like the Secure Enclave) than simply repackaging what already existed.