It is not like sharing a bank account because when it gets hacked, you either never know about it because the bank compensates for the damage before you realize because they have a reason to save their reputation or it is rather easily traceable where the money went and who authorized a transfer.
Yes, I sort of agree with this. I would normally argument against sharing accounts even in families and couples, with the exception the relationship is really trusted. There are such relationships. And even in this case, it could be a good idea to agree on a sort of safety net.
For example, instead of having one key for both, a multisig account made from two wallets with distinct seeds you regularly renew (to avoid it being exposed if one or both parties has better or worse knowledge) could be an interesting idea, because you then know whose key was affected if something goes wrong, and at least the simple "I was hacked!" excuse wouldn't work anymore. This would of course only work for saving/holding purposes, if you move the funds around it would become extremely complicated due to the continuous renewal of the multisig addresses,
Another idea could be that one of both has the keys, but there's a legal agreement that the coins belong to both, and a second key stored e.g. in a bank safe ...
Do you think this could work as an "official recommendation" for the OP list? I guess the details are a bit advanced - but something like "if you share a Bitcoin wallet with your partner, do it only in very trusted relationships, and know exactly what you do and agree on some sort of safety net for the case of a hack." could be a good idea to add.
When buying a hardware wallet, make sure to purchase it on the official website/manufacturer of the chosen hardware wallet brand.
Good tip, adding it!