That's a long article, I skimmed... (get it?)
There are many reasons things like fingerprints are a terrible security measure. One is because they're really easy to steal. Very easy. Ever watch one of those police dramas where the dude gets the other dude some water and then takes his fingerprint? It's that easy. Imagine a wireless device, signal boosted, that can scan the chip in your hand from 20 meters away.... and boom, your "card" is compromised. Oops. BTW, real life hackers have already done this with these new wireless credit cards. Lot easier than fixin' a drink.
But the other problem with fingerprints (or any biometrics) we don't consider that much is this: You can't revoke a fingerprint. It's yours, for life, never changing (Save for costly surgery and/or a lot of pain). If someone compromises your credit card, no problem... Bank revokes card, issues you a new one. How do we do that with stuff planted in our bodies? We have to get it cut out, a whole medical procedure has to happen... But, what happens when the manufacturer realises there's some fundemental flaw in their system and they have to replace all the implants? Sounds like a heck of a lot more work than replacing a plastic card.
In my skimming one person pointed out that plastic works great. I agree. Must be getting old. But I don't see the point.
"Monkey killing monkey killing monkey over pieces of the ground, Silly monkeys, give them thumbs, they make a club and beat their brother down. How they survive, so misguided, is a mystery. Repugnant is a creature who would squander the ability to lift an eye to heaven, conscious of his fleeting time here" - Tool