Using a tech in a way it is not supposed to be used, does not make the tech worse than Touch ID. I could complain that Touch ID doesn't work with wet fingers, or it doesn't work if I don't position my enrolled finger correctly on the little circle. Face ID not working when the camera can't get a good view of you, is not a valid complaint. Touch ID doesn't work if I can't reach my phone to touch it, or if I hold my finger sideways on the circle.
FaceID is better, because it is more seamless. It does NOT take 2x longer to get to the home screen using Face vs. Touch. This has been videoed and posted here. It is a very negligible difference longer. If it is taking you 2 x longer, you are not swiping right away, but are instead waiting for the lock animation to unlock. I pick up my phone and swipe in one motion - BANG - I'm in. To be any faster is almost impossible and it isn't slow (maybe a tad slower than touch ID), so the correct term is super fast (but maybe not quite as fast as touch ID). Then again, failure rate is less with Face ID, since, unlike Touch, face works if you are wet, dirty, etc.
Face ID solves the problem of wet/greasy/dirty/oily fingers. Face ID is more secure and is way faster when using in apps and websites. Not being able to use it lying sideways in bed is a feature, not a bug. The camera can't see you from every conceivable angle, just like holding your finger on the little circle not quite right and touch ID won't work.
In essence, Touch ID was a PHYSICAL process, that required you to align a finger/thumb physically on a specific touch point. Face ID is a digital electronic process, where the physical aspects of mapping to a math representation of your face are done without the user even really noticing. That's why it is more seamless. It is done in 3D space, with a much wider vantage point for use, since although your face has to be viewable, there is way more play in that angle of viewability, than in physically positioning your finger on tiny circle.