Maybe the whole comparison should be done against TouchID gen 1 since this is also the first generation of faceID.
I think FaceID, currently, is almost equally convenient as touchID but when the hardware and software mature through 1 or 2 more itterations (like touchID), the potential of FaceID is far greater than touchID.
I think this post and MAFlynn's post are right. FaceID is great (IMO) but not perfect. I just came up from our cafeteria, where I have something like a 50-60% failure rate with FaceID. I think the issue is that "I'm not holding it right" - the angle that I'm holding the phone doesn't work for the camera. To me, the phone seems fairly picky about what angle and distance will work, and if it doesn't get face input in something pretty close to exactly what it wants, it doesn't cooperate.
Great idea, works most of the time, needs some work. Just like TouchID did a few years back...