[grumdan]

True, except that fingerprint sensors can often be fooled and you cannot change your fingerprint once it becomes "compromised". For instance, anyone who ever visited the US, at least as a non-citizen, will have given their fingerprints to CBP.

I think this only works for an attacker model that excludes reasonably sophisticated attackers. I expect this to thwart pickpockets or muggers, but not the police or anyone more sophisticated than that.