Biometrics include signatures, so if we take it to its extreme, you do need a signature for quite a lot of things.

If that is the case then, one of the objections about identity cards was having an identity register, but one of the points about any register—and we have a passport database, of course—is that you do need to keep a log of people’s data; otherwise the card, as a stand-alone card, is less useful. So presumably therefore you do not have a problem with having a register or a database of biometrics if they were to be included in a card or a passport in the future.