That may be true, but the Bitcoin/bitcoin community needs a way to transact btc in a physical manner
(without phones/computers) that both parties don't know the private keys to.
In theory, the trust has been removed in this product (as long as private key generation is top notch).
For example, this device does what the Casascius Coins could have done,
but this time, the private keys are truly (or purportedly) unknown to anyone other then when it is spent.
With Casascius or other forms of physical btc, the private key is always known to someone.
If I gave someone a paper wallet, and they never swept it, I could have always taken it back.
With this device, that is not possible.
It may be somewhat expensive now and used by a small group of bitcoiners,
but the device and its use will pave the way for new ideas and innovations that adds to
Bitcoin/bitcoin's value and future potential.
As said before, I also think the blockchain is enough. Just get into the store, send Bitcoins from your phone or whatever and bring the goods.
Here's a "physical" thing that would be interesting: Some kind of Trezor like device with retina scanning and fingerprint scanning capabilities and POS terminals accepting these devices. The device has your keys secured, you insert it in the POS terminal and download address and payment information. You take it out, make it scan your retina, hold it for fingerprint scanning and it signs the keys and creates the transaction. When you connect it to the POS it broadcasts it immediately (that, or it broadcasts it right away from your phone). Either this or the devices generates a private key with the funds and "dumps" it immediately on the POS terminal.
One could argue a device like this could be expensive... Yes, but I prefer it like this: one time cost and multiple usage. I think that paying 8$ for something like this is a bigger premium than paying 200$ for something like what I described.
I understand your point and what you mean, but I still don't think it's worth it to order a few of these to regularly use them. I don't think this would bring people to Bitcoin and help it become something you spend daily. I wouldn't like to spend extra 8$ for having to pay for 50$ worth of groceries.
So every time you use one, you're wasting $8...
Yes... And to think people whine about 2 cents transaction fee
Coinbase i think was the first Physical Bitcoin wallet
Casascius was the first.