since i am a noob in the technical stuff, can anyone here say something more about the device?
Stuff such as a Lightning signer seems necessary for the long term. Air-gapped lightning funds aren't possible with the current model.
I think that it works very similarly to LND's remote signing which has been around for quite some time now. I haven't seen any hardware wallet implementation of it, though.
The strength of hardware wallets is that an attacker doesn't have access to the keys, as your hardware wallet is unplugged and needs manual input. That's the whole point. If it's available at all times without prompt or user confirmation, there is no security gain.
If I have my hardware wallet plugged in while browsing Bitcointalk and a transaction pops up on its screen, asking me to confirm it, I won't do it [and immediately start checking my PC for viruses], since I know it wasn't me who initiated the transaction. But the 'Lightning signers' would do exactly that (as they're designed to do exactly that; it's required functionality for a Lightning node).
