"which speeds up the Face ID process and unlocks your iPhone X faster". Do you really think that this is not about the speed? Just think about it. Even if the sensor and the software needed for attention detection is as fast as the 3D scan, for the sensor to see your eyes state one needs to position the phone in front of the eyes. And this takes time. 3D detection does not need it. That would explain the reports that Google's version of face id is faster and works at wider angles."Most reports from iPhone X users say that Face ID disappears as soon as you set it up, unlocking things when you want them, and locking them when you don’t. Probably the best reason for disabling attention awareness is the sunglasses scenario mentioned above, or if you’re a blank-eyed zombie. For everything else, there’s probably not much point switching away from the default."
From the same article you linked. The speed of Face ID has never been an issue except when wearing sunglasses. You still haven't made a point that you can actually back up regarding Face ID.