What are you sophisticated bitcoin thiefs ( and I know you prowl around this forum) gonna do now? huh? you bitches!!! I now have a hardware wallet with a seed and a passphrase at the end of it. You ain't gonna get steal diddly squat.... LOL
If your system is compromised and the system you use to access the hardware wallet will connect to the open web all your data will be recorded even if it is offline ,it all depends upon how you take care of security and a hardware wallet alone could not stop the hackers from stealing your coins. 