Human error is still the biggest reason for crypto loss. A good hardware wallet needs to see from both security and usability perspectives how it can minimize the probability of simple mistakes resulting in catastrophic loss. Keystone's large display allows you to fully preview unsigned transaction details, which can prevent a hacker from swapping their receiving addresses in unnoticed. Designing for usability may be the best way to counter phishing attacks and problems like “blind signing”, still the largest security vulnerability among hardware wallets today.