>>it will get you through the barriers without having to wake up and unlock the phone, as rivals do<<
Security is always a balance between convenience and inconvenience. Convenience appeals on the surface, making it attractive to users, but the inconvenience of security breaches is hidden. It is always the same with computing products - you need to dig deeper and not just be fooled by any in-the-shop whizzbangery.
Samsung are masters of making stuff look good in a shop, but the deeper functionality is a bit thin meaning in the long run less convenience.
It has been the age-old argument in computing to trade security (and correctness) for speed. Mostly, programmers come down on the side of speed, but this has been the wrong decision. We now know that security is of the utmost importance. It sounds from The Register's article that Samsung have done it again and come down on the side of shallow convenience which can lead to long-term inconvenience of having your security compromised.