I love Touch ID on the iPhone and I'm sure it works just as well on the new MBPs. But though Macs and macOS have an insane level of security features built-in, I always thought they were all for not if you backed up your data to an external hard drive. After all (as far as I know) macOS does not have any easy way to keep the contents of an external hard drive encrypted unless you enter a password to unlock it. This means if anyone really wants your data, they should just try stealing your backup drives and not your Macs. I always thought that since Touch ID works so well and FileVault on macOS works so well, it would be great for Apple to make a Touch ID external hard drive that wouldn't allow any computer it was plugged in to access/unencrypt its files without authenticating with your fingerprint first. That way even if someone stole the drive, they couldn't get the data.