You're making the mistake of believing your own subjective opinions of FaceID are objective ones. Other people can and will have different opinions. People use their devices differently, and FaceID and TouchID do perform differently for different people. People will have different grievances with each on them.
Nonetheless, FaceID presents 3 challenges for a folding phone, so it makes sense Apple may not be including it:
1. Two screens means two FaceID modules. One for the inner screen and one of the outer screen.
2. Thickness. The Face ID module is housed in the camera plateau of other iPhones. No such bump out is possible on the outer screen of a folding phone, since when folded, it sits on top of the inner screen.
3. Battery life. Both of the above translate to much less space available for batteries.
There are ways to make FaceID work on a foldable. The easiest method being to add a non-folding portion on the top or side of the phone to hold faceID and cameras that are usable with the phone open or closed, but that comes with it's own set of trade-offs. Regardless of your feelings on the matter, there are certain physical realities that can help explain why Apple may be taking this route.