More like a built-in YubiKey. It's a convenience. When using one's MacBook, you don't need to pull your YubiKey out of your bag/drawer/etc to authenticate, and

More like a built-in YubiKey. It's a convenience. When using one's MacBook, you don't need to pull your YubiKey out of your bag/drawer/etc to authenticate, and if you're traveling you can just leave YubiKey at home/the office, giving you one less thing to lose.