That's not accurate though. Some paper wallets will be more secure than some hardware wallets, sure, but the reverse is also true. Given how I use and store my hardware wallet, the only vector of attack which I am susceptible to is a physical one, which sounds like it is the same case for you and your paper wallets. I'd wager that if an attacker gets his hands on either one of our wallets, it is significantly easier to clear out a paper wallet than it is to build the board to extract the seed from a hardware wallet. In addition to that, since I use multiple long passphrases, this attack wouldn't even work against me.

Your main argument seems to be that it is easier to hide a paper wallet than it is to hide a hardware wallet. A hardware wallet is small enough that I can hide it inside a light fitting, in an electrical socket, under the floorboards, bore a hole in a door/shelf/table/furniture/etc and hide it inside, and so forth. There is a close to zero chance a random attacker would find my hardware wallet without also burning down my house.

How is this different to having an unsecured paper wallet which is written down?

I'm not trying to be deliberately antagonistic here. This finding regarding the Trezor is important, and it should be discussed, but saying that all hardware wallets are useless is wrong.