I think the biggest take here is that fact that as much as hard wallets are open source and are cold wallets, they are not 100% safe. People like to treat them like they are very secure and can't be hacked.
I always think enthusiasts will never claim that open source software is 100% safe. If someone boldly say that, they probably don't know what they're talking about. Even the most popular software used regularly by most people, like Electrum, have been attacked through various ways. The key is how much can we verify. If the code is open source it'd be easier to check every single thing, which is why most people prefer them.