Assuming the hardware wallet isn't following convention and impliments RFC 6979 (a huge red flag) that is. At that point the hardware wallet can be considered t

Assuming the hardware wallet isn't following convention and impliments RFC 6979 (a huge red flag) that is. At that point the hardware wallet can be considered to do all kinds of messed up stuff - what about a wallet that deletes the private keys after X transactions? This is actually a realistic failure mode - hardware wallets do fail even if rare.