[anonporridge]

You're basically describing a bitcoin hardware wallet, many of which can also be used to encrypt/decrypt and sign messages.

These manufacturers are really making exactly what you're describing a reality that is increasingly accessible to the average person. Still not foolproof, but increasingly so. Some, like Blockstream's beta Jade wallet, even work with the QR code scanning like you describe, https://blockstream.com/jade/

The development of this product definitely seems like one of the many positive externalities of bitcoin.