Miners use hardware wallets to sign, which is equivalent to a layer of insurance on their assets, as long as the hardware wallet is not lost, the general situation is very safe. But the bad thing about hardware wallets is that not all projects support the signature of hardware wallets, and when you participate in a PoS project, you need to see how well the hardware wallets and project parties support each other before you can decide whether you can use the hardware wallet to participate in block signing. Another point is that the mainstream hardware wallet Ledger or wired, indicating that this hardware wallet has to remain plugged into the computer, can not be removed, this is still quite ins convenient.