Apple would not have released this technology if they thought it had any chance of not being well received by customers.
Pippin
20th Anniversary Mac
G4 cube
3rd Gen iPod Shuffle (the one with no control buttons)
Mobile Me
Apple Maps
Apple have a long history of releasing products that they though would be well received by the public and weren't - both hardware and software. Some of their biggest flops (Pippin and 20th Anniv. Mac) failed in part because of their high prices.
Regardless of anyone's initial impressions of FaceID at this stage, it is erroneous to suggest that Apple never goes backward.
In the case of the 3rd gen iPod shuffle, they eliminated all physical playback controls on the device and then immediately re-introduced them on all subsequent versions. Apple has a history of adopting a new user interface and abandoning it within a generation because it was not well received by the public.