I use an iPad Pro that is in a keyboard stand most of the time acting pretty much like a laptop. FaceID works very well there. You essentially don’t need to think about it. You sit down and the device is unlocked. It’s not really more convenient than TouchID but it is no less convenient. Convenience is not a reason for or against Face ID. I think it really is just that the tech is still too bulky and not thin enough to use in a laptop. Perhaps, if Apple can miniaturize it enough, they will ,eventually, put it into MacBooks. I think it should be in addition to TouchID not replacing as people have different needs and different working styles but FaceID would be a natural way to interact with a laptop.