How do we trust anything or anyone that it's a complete random generation, we are not in it we are trusting manufacturer's? It's like trusting third party? If any force make them cheat on it how can we protect ourself because people are trusting hardware wallets blindly thinking its 100% safe many have lifetime saving's on it !!
While it may seem paranoid, no one should be trusted blindly, no matter what reputation they have. I have repeatedly written publicly that people live in delusion believing that hardware wallets provide some absolute security, because there is always the possibility that someone will find some critical vulnerability that is unknown at the moment.
I am not technically competent to say whether it is possible for some HW manufacturers to have some kind of backdoor through which they can seamlessly communicate with their devices and maybe even in some sophisticated way get hold of sensitive information. I can only say that it is wrong to believe that something is completely impenetrable just because someone says it.