Apple has made it very clear that the technology doesn't work with identical twins... they're identical, it's kind of a given. For the vast majority of the population, FaceID is far more convenient and transparent to use, and it offers a higher level of security (1/1m chance of a false positive vs 1/50,000 for TouchID).
If you want an iPhone with TouchID, you can still buy the highly capable iPhone SE 2 that uses a different form of bioauthentication. Or, you could use a passcode and not bother with FaceID.
Just because a technology isn't suitable for everyone shouldn't mean that everyone should be deprived of its benefits.